320mm floating front flame rotors are specially designed for use with Moto-Master 4-piston calipers and are not an OE replacementThe inner carrier is an aluminum anodized piece, and rotor thickness has been increased over Moto-Master's Standard Supermoto Rotors to 5mmAll rotors go through a vigorous testing process and are able to withstand temperatures up to 1,004°F without any deformation or friction loss (fading)