MicroChemicals Silicon, Quartz, Glass and Fused Silica Wafer Stock List (Revised: 28.09.2020 19:26 MEZ)


Other wafer types (also cut wafer pieces) and technical details on request: info@microchemicals.eu
       
 1 Inch2 Inch3 Inch4 Inch5 Inch6 Inch8 Inch12 InchStücke
CZ-Si2138 Wafer8105 Wafer7366 Wafer10737 Wafer400 Wafer11307 Wafer1794 Wafer100 Wafer2777 Wafer
FZ-Si0 Wafer788 Wafer496 Wafer2641 Wafer0 Wafer437 Wafer0 Wafer0 Wafer0 Wafer
Si+SiO20 Wafer1001 Wafer614 Wafer2613 Wafer0 Wafer527 Wafer0 Wafer0 Wafer1700 Wafer
Si+SiNx0 Wafer0 Wafer216 Wafer245 Wafer0 Wafer0 Wafer0 Wafer0 Wafer0 Wafer
Quartz200 Wafer180 Wafer69 Wafer181 Wafer0 Wafer0 Wafer0 Wafer0 Wafer143 Wafer
Fused Silica0 Wafer1352 Wafer195 Wafer1092 Wafer0 Wafer200 Wafer0 Wafer0 Wafer12320 Wafer
Glass500 Wafer2030 Wafer548 Wafer1981 Wafer0 Wafer233 Wafer21 Wafer0 Wafer3482 Wafer

4 Inch CZ Silicon Wafers (Czochralski)
Qual.MaterialSize
(inch)
Orien-
tation
PolishedThick-
ness (μm)
DopingResistivity
(ohm cm)
Coating# available
now1/soon2
Article Number
(WebShop)
 
PrimeCZ-Si4(100)double-side185 ± 10Boron1 - 10 444 / 444WSA40185105B1314SNN1
Prime CZ-Si wafer 4 inch, thickness = 185 ± 10 μm, (100), 2-side polished, p-type (Boron) TTV < 5 μm, 1 - 10 Ohm cm, Bow/Warp < 30 μm
Price/wafer (net): € 31.20 (5 wafers), € 25.60 (10 wafers), € 20.00 (25 wafers), € 19.60 (50 wafers), € 19.20 (100 wafers), € 19.00 (200 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side200 ± 10Boron1 - 10 766 / 766WSA40200105B1314SNN1
Prime CZ-Si wafer 4 inch, thickness = 200 ± 10 μm, (100), 2-side polished, p-type (Boron) TTV < 5 μm, 1 - 10 Ohm cm, Bow/Warp < 30 μm
Price/wafer (net): € 31.20 (5 wafers), € 25.60 (10 wafers), € 20.00 (25 wafers), € 19.60 (50 wafers), € 19.20 (100 wafers), € 19.00 (200 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side300 ± 25Phosphor0.1 - 1 182 / 182WSA40300250P1213SNN1
Prime CZ-Si wafer 4 inch, thickness = 300 ± 25 μm, (100), 2-side polished, n-type (Phosphor), TTV < 10 μm, 0.1 - 1 Ohm cm
Price/wafer (net): € 31.20 (5 wafers), € 25.60 (10 wafers), € 20.00 (25 wafers), € 19.00 (50 wafers), € 18.00 (100 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side380 ± 15Boron1 - 10 186 / 486WSA40380155B1314SNN2
Prime CZ-Si wafer 4 inch, thickness = 380 ± 15 μm, (100), 2-side polished, p-type (Boron) TTV < 5 μm, 1 - 10 Ohm cm, Bow/Warp < 30μm
Price/wafer (net): € 28.20 (5 wafers), € 22.60 (10 wafers), € 17.00 (25 wafers), € 16.00 (50 wafers), € 15.00 (100 wafers), € 14.60 (200 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side380 ± 15Boron20 - 100 89 / 89WSA40380155B2415SNN1
Prime CZ-Si wafer 4 inch, thickness = 380 ± 15 μm, (100), 2-side polished, p-type (Boron), TTV < 5 μm, 20 - 100 Ohm cm, Bow < 20 μm, Warp < 25 μm
Price/wafer (net): € 29.20 (5 wafers), € 23.60 (10 wafers), € 18.00 (25 wafers), € 17.00 (50 wafers), € 16.00 (100 wafers), € 15.60 (200 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side400 ± 25Boron8 - 12 125 / 125WSA40400250B8314SNN1
Prime CZ-Si wafer 4 inch, thickness = 400 ± 25 μm, (100), 2-side polished, p-type (Boron) TTV < 10 μm, Bow < 40 μm, 8 - 12 Ohm cm, [2019 Pos. 8] Laser-Marking Class 100 CL 2019 SI2PXXXX
Price/wafer (net): € 30.20 (5 wafers), € 24.60 (10 wafers), € 19.00 (25 wafers), € 18.00 (50 wafers), € 17.00 (100 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side500 ± 15Boron0.01 - 0.02 150 / 150WSA40500150B1121SNN1
Prime CZ-Si wafer 4 inch, thickness = 500 ± 15 μm, (100), 2-side polished, p-type (Boron) TTV < 10 μm, 0.01 - 0.02 Ohm cm, Flats: 2
Price/wafer (net): € 26.60 (5 wafers), € 21.00 (10 wafers), € 15.40 (25 wafers), € 14.80 (50 wafers), € 14.30 (100 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side500 ± 25Boron0.01 - 0.02 44 / 44WSA40500250B1121SNN1
Prime CZ-Si wafer 4 inch, thickness = 500 ± 25 μm, (100), 2-side polished, p-type (Boron), 0.01 - 0.02 Ohm cm, 2 SEMI Flats
Price/wafer (net): € 31.20 (5 wafers), € 25.60 (10 wafers), € 20.00 (25 wafers), € 18.00 (50 wafers), € 17.00 (100 wafers), € 16.00 (200 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side525 ± 15Boron1 - 10 216 / 216WSA40525155B1314SNN1
Prime CZ-Si wafer 4 inch, thickness = 525 ± 15 μm, (100), 2-side polished, p-type (Boron) TTV < 5 μm, 1 - 10 Ohm cm
Price/wafer (net): € 28.00 (5 wafers), € 22.40 (10 wafers), € 16.80 (25 wafers), € 16.20 (50 wafers), € 15.60 (100 wafers), € 15.00 (200 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side525 ± 25Boron0.1 - 1 22 / 22WSA40525250B1213SNN1
Prime CZ-Si wafer 4 inch, thickness = 525 ± 25 μm, (100), 2-side polished, p-type (Boron), TTV < 10 μm, 0.1 - 1 Ohm cm
Price/wafer (net): € 28.70 (5 wafers), € 23.10 (10 wafers), € 17.50 (25 wafers), € 16.60 (50 wafers), € 15.00 (100 wafers), € 14.20 (200 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side600 ± 15Phosphor1 - 10 9 / 9WSA40600155P1314SNN2
Prime CZ-Si wafer 4 inch, thickness = 600 ± 15 μm, (100), 2-side polished, n-type (Phosphor) TTV < 5 μm, 1 - 10 Ohm cm, Flats: 2, [InvP]
Price/wafer (net): € 15.40 (25 wafers) (plus packaging / shipping). One carrier with 9 wafer is also available.
 
PrimeCZ-Si4(100)double-side600 ± 25Phosphor1 - 10 100 / 100WSA40600250P1314SNN1
Prime CZ-Si wafer 4 inch, thickness = 600 ± 25 μm, (100), 2-side polished, n-type (Phosphor) TTV < 10 μm, 1 - 10 Ohm cm
Price/wafer (net): € 28.00 (5 wafers), € 22.40 (10 wafers), € 16.80 (25 wafers), € 16.00 (50 wafers), € 15.60 (100 wafers), € 15.00 (200 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side800 ± 25Boron1 - 10 72 / 72WSA40800250B1314SNN1
Prime CZ-Si wafer 4 inch, thickness = 800 ± 25 μm, (100), 2-side polished, p-type (Boron), 1 - 10 Ohm cm
Price/wafer (net): € 32.20 (5 wafers), € 26.60 (10 wafers), € 21.00 (25 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side1500 ± 25Boron1 - 10 211 / 211WSA41500250B1314SNN1
Prime CZ-Si wafer 4 inch, thickness = 1500 ± 25 μm, (100), 2-side polished, p-type (Boron), 1 - 10 Ohm cm
Price/wafer (net): € 39.20 (5 wafers), € 33.60 (10 wafers), € 28.00 (25 wafers), € 27.00 (50 wafers), € 26.00 (100 wafers), € 25.00 (200 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side4000 ± 25Boron1 - 10 0 / 25WSA44000250B1314SNN1
Prime CZ-Si wafer 4 inch, thickness = 4000 ± 25 μm, (100), 2-side polished, p-type (Boron), 1 - 10 Ohm cm, 2 flats (SEMI standard), units of 25 wafers, wafers separated by paper sheet, not particle specified
Price/wafer (net): € 40.00 (25 wafers), € 38.00 (50 wafers), € 36.50 (100 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(111)double-side525 ± 25Boron0.1 - 1 34 / 34WSC40525250B1213SNN1
Prime CZ-Si wafer 4 inch, thickness = 525 ± 25 μm, (111), 2-side polished, p-type (Boron), TTV < 10 μm, 0.1 - 1 Ohm cm
Price/wafer (net): € 29.20 (5 wafers), € 23.60 (10 wafers), € 18.00 (25 wafers), € 17.00 (50 wafers), € 16.00 (100 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)one-side325 ± 25Boron1 - 10 111 / 111WSD40325250B1314SNN1
Prime CZ-Si wafer 4 inch, thickness = 325 ± 25 μm, (100), 1-side polished, p-type (Boron) TTV < 10 μm, 1 - 10 Ohm cm
Price/wafer (net): € 27.20 (5 wafers), € 21.60 (10 wafers), € 16.00 (25 wafers), € 15.00 (50 wafers), € 14.50 (100 wafers), € 14.00 (300 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)one-side525 ± 15Arsenic0.001 - 0.005 110 / 110WSD40525150A1050SNN1
Prime CZ-Si wafer 4 inch, thickness = 525 ± 15 μm, (100), 1-side polished, n-type (Arsenic) TTV < 10 μm, 0.001 - 0.005 Ohm cm, Flats: 1 SEMI Flat
Price/wafer (net): € 23.80 (5 wafers), € 18.20 (10 wafers), € 12.60 (25 wafers), € 12.20 (50 wafers), € 11.70 (100 wafers), € 11.20 (200 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)one-side525 ± 15Boron10 - 20 190 / 190WSD40525155B1424SNN1
Prime CZ-Si wafer 4 inch, thickness = 525 ± 15 μm, (100), 1-side polished, p-type (Boron) TTV < 5 μm, 10 - 20 Ohm cm, Flats: 2, [InvP]
Price/wafer (net): € 25.80 (5 wafers), € 20.20 (10 wafers), € 14.60 (25 wafers), € 14.20 (50 wafers), € 13.70 (100 wafers), € 13.20 (200 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)one-side525 ± 25Boron0.001 - 0.005 0 / 176WSD40525250B1050SNN1
Prime CZ-Si wafer 4 inch, thickness = 525 ± 25 μm, (100), 1-side polished, p-type (Boron), 0.001 - 0.005 Ohm cm
Price/wafer (net): € 26.20 (5 wafers), € 19.00 (19 wafers), € 15.00 (25 wafers), € 14.60 (50 wafers), € 14.20 (100 wafers), € 13.90 (300 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)one-side525 ± 25Boron1 - 10 864 / 864WSD40525250B1314SNN2
Prime CZ-Si wafer 4 inch, thickness = 525 ± 25 μm, (100), 1-side polished, p-type (Boron) TTV < 10 μm, 1 - 10 Ohm cm
Price/wafer (net): € 24.80 (5 wafers), € 19.20 (10 wafers), € 13.60 (25 wafers), € 13.20 (50 wafers), € 12.60 (100 wafers), € 12.20 (300 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)one-side525 ± 25Boron10 - 20 125 / 125WSD40525250B1424SNN1
Prime CZ-Si wafer 4 inch, thickness = 525 ± 25 μm, (100), 1-side polished, p-type (Boron), TTV < 10 μm, 10 - 20 Ohm cm, 2 SEMI Flats
Price/wafer (net): € 27.20 (5 wafers), € 21.60 (10 wafers), € 16.00 (25 wafers), € 15.00 (50 wafers), € 14.00 (100 wafers), € 13.00 (300 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)one-side525 ± 25Phosphor1 - 10 50 / 50WSD40525250P1314XNN1
Prime CZ-Si wafer 4 inch, thickness = 525 ± 25 μm, (100), 1-side polished, n-type (Phosphor) TTV < 10 μm, 1 - 10 Ohm cm, no flat
Price/wafer (net): € 25.40 (5 wafers), € 19.80 (10 wafers), € 14.20 (25 wafers), € 13.80 (50 wafers), € 13.20 (100 wafers), € 12.80 (300 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)one-side525 ± 25Phosphor1 - 10 149 / 149WSD40525250P1314XNN2
Prime CZ-Si wafer 4 inch, thickness = 525 ± 25 μm, (100), 1-side polished, n-type (Phosphor) TTV < 10 μm, 1 - 10 Ohm cm
Price/wafer (net): € 24.80 (5 wafers), € 19.20 (10 wafers), € 13.60 (25 wafers), € 13.20 (50 wafers), € 12.80 (100 wafers), € 12.50 (300 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(110)one-side525 ± 25Boron1 - 10 95 / 95WSE40525250B1314SNN1
Prime CZ-Si-Wafer 4 inch, thickness = 525 ± 25 μm, (110), 1-side polished, p-type (Boron) TTV < 10 μm, 1 - 10 Ohm cm, 2 SEMI Flats (Primary Flat @ [111], S Flat @ [111] 109.5° CW from PF)
Price/wafer (net): € 43.20 (5 wafers), € 37.60 (10 wafers), € 32.00 (25 wafers), € 28.00 (50 wafers), € 25.00 (100 wafers), € 23.00 (200 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(111)one-side450 ± 250.01 - 0.05 42 / 42WSF40450250X1151SNN1
Prime CZ-Si wafer 4 inch, thickness = 450 ± 25 μm, (111) +4° tilt, 1-side polished n-type (Antimon, Sb), TTV < 10 μm, 0.01 - 0.05 Ohm cm
Price/wafer (net): € 26.20 (5 wafers), € 20.60 (10 wafers), € 15.00 (25 wafers), € 14.00 (50 wafers), € 13.60 (100 wafers), € 13.20 (200 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(111)one-side525 ± 25Phosphor1 - 10 84 / 84WSF40525250P1314SNN2
Prime CZ-Si wafer 4 inch, thickness = 525 ± 25 μm, (111), 1-side polished, n-type (Phosphor), TTV < 10 μm, 1 - 10 Ohm cm
Price/wafer (net): € 25.20 (5 wafers), € 19.60 (10 wafers), € 14.00 (25 wafers), € 13.60 (50 wafers), € 13.20 (100 wafers), € 12.80 (300 wafers) (plus packaging / shipping)
 
TestCZ-Si4(100)one-side525 ± 25Boron1 - 20 450 / 450WSM40525250B1324XNN1
Test CZ-Si wafer 4 inch, thickness = 525 ± 25 μm, (100), 1-side polished, p-type (Boron) TTV < 20 μm, 1 - 20 Ohm cm, Laser-marking on polished side, 2.5 - 3.0 mm height: 206M-XXXX (XXXX = consecutive number 0001 - 9999)
Price/wafer (net): € 13.00 (25 wafers), € 12.00 (50 wafers), € 11.50 (100 wafers), € 10.70 (300 wafers), € 10.20 (500 wafers), € 9.80 (1000 wafers) (plus packaging / shipping)
 
TestCZ-Si4(100)one-side525 ± 25Boron1 - 10 2450 / 2450WSM4052525XB1314SNN1
Test CZ-Si wafer 4 inch, thickness = 525 ± 25 μm, (100), 1-side polished, p-type (Boron), 1 - 10 Ohm cm
Price/wafer (net): € 11.00 (25 wafers), € 10.70 (50 wafers), € 10.50 (100 wafers), € 10.00 (300 wafers), € 9.50 (500 wafers), € 9.00 (1000 wafers) (plus packaging / shipping)
 
TestCZ-Si4(100)one-side625 ± 25Boron1 - 10 150 / 150WSM4062525XB1314SNN1
Test CZ-Si wafer 4 inch, thickness = 625 ± 25 μm, (100), 1-side polished, p-type (Boron), 1 - 10 Ohm cm, 2 SEMI flats
Price/wafer (net): € 11.50 (25 wafers), € 10.50 (50 wafers), € 10.20 (100 wafers), € 10.00 (200 wafers) (plus packaging / shipping)
 
Dummy3CZ-Si4(111)double-side500 ± 25Phosphor5 - 100 650 / 650WSU40500250P5315XNN1
Dummy CZ-Si wafer 4 inch, thickness = 500 ± 25 μm, (111), 2-side polished, n-type (Phosphor), 5 - 100 Ohm cm, packed in units of 25 wafers in carriers, NO FLAT, tiny scratches possible, not particle-specified
Price/wafer (net): € 8.50 (25 wafers), € 8.00 (50 wafers), € 7.50 (100 wafers), € 7.00 (200 wafers), € 6.50 (400 wafers) (plus packaging / shipping)
 
Dummy3CZ-Si4(100)one-side500 ± 50Boron0.001 - 100 900 / 900WSV40500500B1015XNN1
Dummy CZ-Si wafer 4 inch, thickness = 500 ± 50 μm, (100), 1-side polished, p-type (Boron), 0.001 - 100 Ohm cm, not particle-specified, tiny scratches possible, units of 50 wafers (cake-box)
Price/wafer (net): € 7.00 (50 wafers), € 6.50 (100 wafers), € 6.00 (200 wafers), € 5.50 (500 wafers) (plus packaging / shipping)
 
Dummy3CZ-Si4(100)one-side500 ± 50Boron0.001 - 100 350 / 350WSV4050050XB1015XNN1
Dummy CZ-Si wafer 4 inch, thickness = 500 ± 50 μm, (100), 1-side polished, p-type (Boron), 0.001 - 100 Ohm cm, not particle-specified, units of 25 wafers (carriers)
Price/wafer (net): € 7.50 (25 wafers), € 7.00 (50 wafers), € 6.80 (100 wafers), € 6.40 (200 wafers), € 6.00 (500 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side300 ± 100.002 - 0.004 0 / 84(5)WSA40300105X2040SNN#
Prime CZ-Si wafer 4 inch, thickness = 300 ± 10 μm, (100), 2-side polished, TTV < 5 μm, 0.002 - 0.004 Ohm cm, Flats: 2
Price/wafer (net): € 29.60 (5 wafers), € 22.40 (10 wafers), € 16.80 (25 wafers), € 16.20 (50 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side100 ± 5Boron0 - 0.01 0 / 25(5)WSA40100055B0011SNN#
Prime CZ-Si wafer 4 inch, thickness = 100 ± 5 μm, (100), 2-side polished, p-type (Boron) TTV < 5 μm, 0 - 0.01 Ohm cm, Flats: 2
Price/wafer (net): € 68.80 (5 wafers), € 61.60 (10 wafers), € 56.00 (25 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side380 ± 15Phosphor2 - 10 0 / 340(5)WSA40380155P2314SNN#
Prime CZ-Si wafer 4 inch, thickness = 380 ± 15 μm, (100), 2-side polished, n-type (Phosphor) TTV < 5 μm, 2 - 10 Ohm cm, Flats: 2
Price/wafer (net): € 29.60 (5 wafers), € 22.40 (10 wafers), € 16.80 (25 wafers), € 16.20 (50 wafers), € 15.60 (100 wafers), € 15.00 (200 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side525 ± 25Phosphor1 - 10 0 / 50(5)WSA40525250P1314SNN#
Prime CZ-Si wafer 4 inch, thickness = 525 ± 25 μm, (100), 2-side polished, n-type (Phosphor) TTV < 10 μm, 1 - 10 Ohm cm, Flats: 2
Price/wafer (net): € 29.60 (5 wafers), € 22.40 (10 wafers), € 16.80 (25 wafers), € 16.20 (50 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side1000 ± 25Phosphor0 - 0.005 0 / 15(5)WSA41000250P0050SNN#
Prime CZ-Si wafer 4 inch, thickness = 1000 ± 25 μm, (100), 2-side polished, n-type (Phosphor) TTV < 10 μm, 0 - 0.005 Ohm cm, Flats: 1
Price/wafer (net): € 33.80 (5 wafers), € 26.60 (10 wafers), € 21.00 (25 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(100)double-side800 ± 20Boron1 - 10 0 / 145(5)WSA40800200B1314SNN#
Prime CZ-Si wafer 4 inch, thickness = 800 ± 20 μm, (100), 2-side polished, p-type (Boron) TTV < 10 μm, 1 - 10 Ohm cm, Flats: 2
Price/wafer (net): € 32.40 (5 wafers), € 25.20 (10 wafers), € 19.60 (25 wafers), € 18.90 (50 wafers), € 18.20 (100 wafers) (plus packaging / shipping)
 
PrimeCZ-Si4(110)one-side525 ± 15Boron5 - 8 0 / 100(5)WSE40525155B5383SNN#
Prime CZ-Si wafer 4 inch, thickness = 525 ± 15 μm, (110), 1-side polished, p-type (Boron) TTV < 5 μm, 5 - 8 Ohm cm, Flats: 2
Price/wafer (net): € 40.80 (5 wafers), € 33.60 (10 wafers), € 28.00 (25 wafers), € 27.00 (50 wafers), € 26.00 (100 wafers) (plus packaging / shipping)
 
XCZ-Si4###525 ± 15Boron1 - 10 0 / 75(5)WSX40525150B1314SNN#
X CZ-Si wafer 4 inch, thickness = 525 ± 15 μm, , p-type (Boron) TTV < 10 μm, 1 - 10 Ohm cm, Flats: 1
Price/wafer (net): € 26.80 (5 wafers), € 19.60 (10 wafers), € 14.00 (25 wafers), € 13.50 (50 wafers) (plus packaging / shipping)
Interested in an offer? Please send us an e-mail with the article numbers(s) (20-digit code in the right column of the table above) and number to info@microchemicals.com
1 available when this list has been revised
2 available + ordered (= available in typically few weeks)
3 Wider specified, rather cheap wafers for e. g. resist coating tests or start-up experiments for new litho-processes.
4 prices subject to change; while stocks last.
5 possibly available on demand within approx. 1 - 2 weeks.

 
       
We try to revise this stock list daily or weekly, but we cannot guarantee that it's always up-to-date.