Forged Dynapro - ST 4 piston radial mount calipers are coupled with the high cooling capacity of Wilwoods proprietary Spec - 37 material 11.75 diameter GT 36 directional vane rotors to provide the ultimate brake package for unrestricted road race competition. High temperature, fluid and abrasion resistant proprietary type III anodize finish is standard with DynaproST calipers. Thermlock pistons in the calipers resist fade and extend service life by reducing the heat transfer from the pads, caliper body, fluid, and seals. Rotors dynamically mount to the hubs with forged aluminum hats and radial mount brackets secure the caliper to the spindle in the OE location without modification. Kits also include high temperature, high friction race compound pads and all premium grade fasteners.