KMC hairpin 10-speed KMC / Shimano Size: 1/2 X 11/128 DLC DLC Technology: Extremely Durable, Extremely Precise. Unmatched durability is achieved through precision-hardened and meticulously polished pins and inner plates. Our DLC chains are coated with a diamond-like coating for a long-lasting, visually appealing black finish. Furthermore, this coating provides an exceptionally smooth surface for excellent shifting performance.