Galfer Bicycle brake rotors are laser cut - never stamped - in Galfer's patented design out of virgin high-carbon 420 stainless steel. Every rotor is then double disc-parallel ground to assure perfectly parallel flatness and the non-braking surface is treated to prevent corrosion. The design allows for superior airflow and cooling to keep your braking system cooler. Galfer rotors are designed to provide powerful braking in all conditions. Seamlessly replaces stock rotor. Sold individually.