Box Two Prime 9 Speed MTB CassetteThis Box Two cassette was where Prime 9 started. Originally conceived as an E-MTB product to deliver long service life and extra range over fewer gears, Box quickly grew to enjoy its abilities on unpowered MTBs. All of this model’s cogs are stamped from steel and subsequently, the larger ones are pinned to alloy spiders. Due to its provenance, this is, without doubt, the most durable cassette in the range.FAQ:Will the Box Two Prime 9 Cassette fit on an wheel with a Sram XD Driver? No this will only work with a HG splined Shimano 9-10-11 speed freehub body.Is the Box Two Prime 9 Cassette compatible with other 9 speed drivetrains? No, The Box Two Prime 9 Cassette is optimized for Box Prime 9 drivetrains and running other component variations can result in poor performance.How should I clean my Two Prime 9 Cassette? We suggest removing the cassette from the wheel and using a soft bristle brush with soapy water or a mild de-greaser. We do not recommend pressure washing, strong solvents or de-greasers as they could degrade the surface coating.Features: Material: Hardened Alloy Steel, Aluminum Cogs Pinned to Lightweight Spiders Ultra-Wide Ratio with Consistent Progression Prime 9 Technology Box’s Most Durable Cassette Compatible with HG Freehub Bodies Not Intended for E-Bike UseCompatibility: Box One Prime 9 Chain 126L DLC Black Box Two Prime 9 126 Link Chain Nickel Box Three Prime 9 126 Link Chain Polished Box One Prime 9 Rear Derailleur Box Two Prime 9 X-Wide Rear Derailleur Black Box Three Prime 9 X-Wide Rear Derailleur Black Box One Prime 9 Shifter Black Box Two Prime 9 Shifter Black Box Three Prime 9 Shifter BlackWeight: 645gBuy Box Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.