Sram: THE NEXT GENERATION OF SRAMLeveraging the legendary history of SRAM shifting, the GX 2x10 rear derailleur provides incredible shifting speed and precision. EXACT ACTUATION™ technology eliminates slop and shifting variation. ROLLER BEARING CLUTCH™ technology delivers maximum drivetrain stability—even through the most punishing terrain. And with CAGE LOCK™ technology, wheel removal and installation are easier than ever.THINGS TO REMEMBER• EXACT ACTUATION™ for precise and dependable 10-speed performance• TYPE 2.1 technologies: ROLLER BEARING CLUTCH™ and CAGE LOCK™ (also available without TYPE 2.1 configurations)• Cage lengths: Short, Medium and Long• REPLACES X7 & X9 10 SPEED REAR DERAILLEURSPECIFICATIONSSpeed (RD):  10sCable pull ratio:  Exact actuationCage (RD):  Short, Medium, LongMax tooth:  36Colour (RD):  BlackPulley bearings material:  SteelCage material (RD):  Aluminium