This system features the 6-piston, 6P caliper mounted to a 13", 1-piece slot, drill, zinc plated integral hub rotor. The 6P caliper has D.O.T compliant dust and weather seals and uses the popular D0731 pad type. Rotors come with bearing races installed and premium bearings packed with Redline synthetic grease and new dust caps. All mounting brackets, stainless braided hoses and hardware are also included. The 13" Pro is designed to fit most 17” or larger wheels.