Compatible with all 12-speed derailleur systems (except SRAM Eagle Transmission T-Type, 12-speed road/gravel) Includes MissingLink clip Designed specifically for electric bikes with mid-mounted motors Item no.: BE12TBB30 Size: 1/2 X 11/128 Color: Black Pin length: 5.2 mm Weight per 110 cells: 282 g Length: 130 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. BlackTech It remains permanently black. KMC BlackTech is not just a coating; it's a surface treatment that integrates the color into the material. The process involves two steps: first, each individual chain component is treated, and then the process is repeated with the assembled components. As a result, the chain permanently retains its deep black color and exhibits exceptional rust resistance.