Compatible with all 12-speed derailleur systems (except SRAM Eagle Transmission T-Type, 12-speed road/gravel) Perfect shifting thanks to Double X-Bridge Includes MissingLink Connector Item no.: BX12AB126 Size: 1/2 X 11/128 Color: Aurora green Pin length: 5.2 mm Weight per 110 cells: 268 g Length: 126 links X-Series Your bike deserves it. The KMC X series is designed with the specific characteristics of Shimano, SRAM, and Campagnolo systems in mind, meeting the most demanding requirements. Carefully designed and manufactured, X-Bridge technology, thanks to precisely chamfered plates, enables smooth drivetrains and perfect gear shifting in every riding situation. The X series is trusted by many top athletes in professional cycling.