Campagnolo 11 Speed Super Record Cassette made from Steel with 6 titanium sprockets to give an excellent compromise between weight savings and cost. The Ultra-Shift aluminium frame for last two sprocket triplets gives precision and greater stiffness whilst the Ultra-Shift sprockets synchronization allows for improved shifting precision and less stress for the chain. The Ultra-Shift teeth shape also gives upshift optimization, longer life and lower wear. The Nickel-chrome surface treatments on steel also helps this.