SRAM's lightweight PC 1091 HollowPin Chain features a nickel plated finish on both the inner and outer links to provide shifting performance that is as tough as it is smooth. As the name suggests, the PC 1091 uses hollow, chrome hardened pins that not only save weight roughly 20 grams lighter than a chain with solid pins, but also enhance durability. For a quieter ride, SRAM designed the PC 1091 with more chamfer on the inside of the outer plates. And to make installation quick and easy, SRAM built the PC 1091 with the PowerLock connecting link, meaning you can install the chain without a special tool this is the only sub 6mm chain out there that has this feature. The SRAM PC 1091 HollowPin Chain is made specifically for 10 speed drivetrains and pairs perfectly with the shape of SRAM cassettes and chainrings to provide optimal and effortless shifting. The PC 1091 is compatible with Shimano 10 speed drivetrains as well.