The PC-951 replaces the PC-950 chain and features step riveted grey links, pre-lubed with Gleitmo lube and provide long lasting durability and dependability with increased corrosion resistance. The PC-951 is slightly narrower than the PC-950 for improved shifting. Not much else to say except this is a great basic and reliable 9 speed chain. Perfect for the budget minded 9 speed drivetrain owner. Works with all 9 speed system except for Campagnolo. Includes Proven PowerLink connector.