If you\'re a rider whose performance needs or riding style dictates that you run a 9 speed drivetrain, the PG 970 is your only choice for light weight, strength, and precise shifting. Get the same reliable, lightweight performance BlackBox racers enjoy. Tested on the pro circuit. Proven on the podium. SRAM PowerGlide II 9-speed cassettes meet the demands of mtbers everywhere - from elite racers to weekend trail ridersType: PowerGlide IISpeed: 9 Recommended Chain: PC-990, PC-970, PC-950 Lock Ring: Satin Chrome / Anodized Alloy Finish: Satin Chrome .