Compatible with all 12-speed derailleur systems (except SRAM Eagle Transmission T-Type, 12-speed road/gravel) EPT, maximum corrosion protection Contains MissingLink Perfect shifting thanks to the double X bridge Durability: Item no.: BX12EP126 Size: 1/2 X 11/128 Color: Dark Silver 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. EPT Rust protection redefined. KMC's non-toxic and environmentally friendly EcoProTeQ Technology (EPT) provides chains with corrosion protection (first signs of rust appear after 650 hours of salt spray testing), doubling the durability of conventional rust protection and setting new standards. EcoProTeQ EPT non-toxic, environmentally friendly 100% coating: each cell element is treated separately first traces of rust only after 650 hours of salt spray testing (twice as long as conventional rust protection) smooth surface ensuring excellent driving properties minimized dirt accumulation, which reduces maintenance costs.