A performance alternative to the Flattop chains. Precision-engineered for modern 12-speed SRAM Flattop drivetrains, the Connex 12SR delivers razor-sharp shifting, maximum durability â with zero compromise. Included: the legendary Connex Link â tool-free, in sleek black, and ready to ride.Made in Germany using long-lasting, heat-treated steel with a corrosion-resistant high quality Nickel silver finish.Supplied with the exclusive, re-usable, tool-free Connex QR joining Black link.Compatible with SRAM Flattop bicycle 12-Speed transmission gear systems only.