This Box Three cassette draws from both of its Box One & Box Two siblings to create a sensible all-rounder. All of this model's cogs are stamped from steel & subsequently, the larger ones are pinned to steel spiders. The main difference here versus Box Two is the use of additional weight-reducing holes on its cogs. Compatibility: • 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 Black FAQ: Will the Box Three Prime 9 Cassette fit on a 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 Three Prime 9 Cassette compatible with other 9 speed drivetrains? No, The Box Three Prime 9 Cassette is optimized for Box Prime 9 drivetrains & running other component variations can result in poor performance. How should I clean my Three Prime 9 Cassette? We suggest removing the cassette from the wheel & using a soft bristle brush with soapy water or a mild degreaser. We do not recommend pressure washing, strong solvents or de-greasers as they could degrade the surface coating.