This system features the 6-piston, 6P caliper mounted to a 13", 2 piece slot, drill, zinc plated rotor. The 6P caliper has D.O.T compliant dust and weather seals and uses the popular D0731 pad type. Billet aluminum hubs come assembled with premium bearings packed with Redline synthetic grease and billet dust caps. Rotors are pre-assembled with NAS high grade stainless hardware. All mounting brackets and hardware are also included. The 13" Pro+ is designed to fit most 17” or larger wheels.