SRAM X01 DH Rear Derailleur - 7-Speed, Short Cage, Black, with Clutch, A3

The clutch features a smoother torque curve for a quieter, more consistent operation and feel. The 12-tooth X-SYNC pulley wheel holds the chain in place, reducing bounce and chain slap. Pair the the SRAM X01 DH 7-speed shifter for full X-Actuation technology.

eBay