Super Alloy Steel 10.50 x .780 Vented Rotors are one of Sprint racing's lightest .750 to .810 thickness class rotor at a weight of only 3.20 pounds. Wilwood's proprietary Super Alloy Steel greatly enhances the durability and lifespan of this rotor over comparable lightweight steel or iron rotors. A Drilled, slotted, and scalloped design with 24 cooling vanes provides excellent high temperature stability, rapid heat dissipation, and consistent performance from the brake pads.