* Technology: PowerGlide II — proven cassette technology engineered for smooth, reliable shifting on a wide range of drivetrains * Cassette design optimized for MTB and aggressive riding — more reliable, more durable and better performing thanks to an optimal tooth profile and shift ramp design for quick, positive index shifting * Lock ring material / finish: heat treated steel / steel for lasting strength and secure engagement * Sprocket material / finish: chrome plated for enhanced wear resistance and corrosion protection * Recommended chain compatibility: PC-991, PC-971, PC-951 — ensures consistent performance when paired with matched chains * Built to deliver dependable, crisp shifts and long service life for riders seeking a robust bicycle cassette solution