KMC - X11EL CHAINS The KMC X-Series has been designed with the specific characteristics of the Shimano, SRAM and Campagnolo systems in mind and will meet the most demanding requirements. Elaborately designed and manufactured, the X-Bridge technology, thanks to precisely chamfered plates, allows a smooth propulsion and perfect gear changes in all driving situations. The X-series is trusted by many top athletes in professional cycling. A pro level 11-speed extra light chain with precisely chamfered X-Bridge and punched plates, also available in a duarble BlackTech coating. Compatible with all 11-speed derailleur systems Extra Light slotted inner- and outer plates save weight and shed mud High Rigidity design for quick response and higher efficiency Highest pin power with unsurpassed riveting geometry Perfect shifting thanks to Double X-Bridge design and plate chamfering 3X stretchproof durabilty Includes a MissingLink Available in Silver or BlackTech BlackTech Stays black permanently. KMC BlackTech is not a mere 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 procedure is repeated with the assembled elements. As a result, the chain maintains its deep black color permanently and exhibits exceptional rust resistance. Size: 1/2" x 11/128" Speed of Sprocket: 11 Compatible Bikes: Road Bike, Mountain Bike Connecting Link: CL555 (Non-reusable)