Leveraging the legendary shifting history of SRAM, the GX 2x10 rear derailleur delivers incredible shifting speed and precision.EXACT ACTUATION™ technology eliminates slope and shift variations.ROLLER BEARING CLUTCH™ technology provides maximum drivetrain stability, even on the most challenging terrain.And with CAGE LOCK™ technology, wheel removal and installation is easier than ever.Features:EXACT ACTION ™ for precise and reliable 10-speed performance.Cage lengths: short, medium and longAlso available without ROLLER BEARING CLUTCH™Speeds: 10 speedsMaterial: aluminum cageWeight: 302g (long cage with ROLLER BEARING CLUTCH ™)Compatibility: EXACT ACTUATION™Cage sizes: long, medium, shortWith CAGE LOCK™ technology in the rear derailleur, removing and installing the wheel™ as well as installing the chain™ becomes faster and easier.