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 riders. Type: PowerGlide II. Speed: 9. Recommended Chain: PC-990, PC-970, PC-950. Lock Ring: Satin Chrome Anodized Alloy. Finish: Satin Chrome.