The Sram NX Eagle Rear Derailleur provides durability, silent operation, smooth and fast shifting, stability, and eliminates ghost shifting, during your mountain biking activities. It is compatible with 50 teeth and 12 speeds and includes a bearing clutch that eliminates chain bounce and bumps.This bike rear derailleur is made of steel, as well as pulley bearings. The X SYNC technology offers good performance, easy shifting, and silent operation. The Eagle technology allows for smooth transmission, which is easy to maneuver and keeps the chain stable at all times. Besides, it comes with a cage lock that makes wheel removal easier. The X HORIZON allows for faster and effortless shifting. It features X-Actuation technology specially designed for 1x transmissions and avoids ghost shifting.SRAM rear derailleur ´´NX Eagle´´ 12-speed, X-Horizon, type 3 steel cage, Roller Bearing Clutch Technology for regulation of chain tension, cage lock makes wheel removal and installation easier, weight:339g.