Product Description Shimano sprocket Dura-Ace CS-9000 / CS-9100 - for 12-25 and 12-28 gradations This Shimano sprocket fits into Dura-Ace CS-9000 11-speed cassettes with 12-25 and 12-28 gradations. The CS-R9100 cassette is also compatible. The sprocket is made of steel and has 13 teeth (with integrated spacer) or 17 teeth. The 14-, 15- and 16-tooth versions are identical with the sprockets for 11-23 to 11-28 gradations. Technical Information:Gearing:11Gradation:12-25, 12-28Models:12 tooth: sold-out, please use CS-R9100 Y-1VT12100 sprocket as a spare Compatibility:CS-9000Type:w/ integrated spacerManufacturer Number:Y-1YC12100 13 tooth: Compatibility:CS-9000, CS-R9100Type:w/ integrated spacerManufacturer Number:Y-1YC13100 17 tooth: Compatibility:CS-9000, CS-R9100Manufacturer Number:Y-1YC17200 Note:14, 15 & 16 tooth sprockets are identical to sprocket for CS-9000 11-23 / 11-25 / 11-28.Contents:1 x Shimano Dura-Ace CS-9000 sprocket Manufacturer: Shimano Europe B.V. High Tech Campus 92 5656 AG Eindhoven Netherlands info@shimano-eu.com