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Sram eTap AXS is known to be louder than other drivetrains. Our HOLLOWcage® with Silent " Xring Pulley™ " completely eliminates this problem allowing you to enjoy the ride. Size (Mass +/-1g): 69g Color Lower lockring: PVD Rainbow, Black, Titanium, Red, Gold ; Upper lockring: Black Compatibility: Sram eTap AXS Red & Force 12spd derailleurs. Works with 10-28T & 10-33T & 10-36T cassettes (check chain length calculation at the bottom). Not compatible with Sram XPLR and 11spd Red / Force. Works ONLY with AXS Flat Top chain. Do NOT mount any other chain. Materials used: Carbon fiber-polymer matrix, 7075 Aluminium, rubber, ceramics In the box Complete cage, lockring tool, special tool, 2x spare xring rubbers