Heavy Duty 36 Curved vane/plain face replacement friction ring for Wilwood 12.19" big brake kits. More heat capacity than the Ultralight 32 straight vane rotor, this is what we recommend for track use. Price is for one rotor. These rotors are DIRECTIONAL (left and right specific), so if you order two we will send you one left and one right. If you order one, you need to tell us which side you need.