SRAM GX 10 Speed Rear Derailleur Colour:Black 2 uses two different insert

2 uses two different insert rings to install bearing races on the 1

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SRAM GX 10 Speed Rear Derailleur Colour:Black 2 uses two different insertAbout SRAM GX 10 Speed Rear Derailleur Leveraging 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. Features EXACT ACTUATION