The Power Glide II 970 cassette is a great choice for riders running a 9-speed drivetrain. SRAM PG-970 cassette performance is optimized by tooth profile and shift ramp design for quick and positive index shifting. Steel cogs provide strength and durability. Technologies: PowerGlide II Sprocket combination: 11-12-14-16-18-21-24-28-32T Weight: 322g