The SRAM RED AXS 12-speed Flattop Chain features a unique link shape that allows the chain to be narrower and lighter while increasing strength and providing more tolerance between cogs.Features-Flattop technology enables a narrower chain with quieter operation and increased strength and durability-Compatible only with eTap AXS rear derailleurs-Hard Chrome plated inner and outer plates allow for faster and more precise shifts-HollowPin construction provides increased strength and efficiency-Requires Flattop Powerlock chain connectorItem Specifications-Links (links):120-Drivetrain Speeds:12-Chain Connection Type:Single Use-Color:Silver-Half Link Chain:No-Defined Color:Silver