This Pro system comes with the 2-piece 6-piston, 6P caliper mounted to a 13.5", 1-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. Mounting brackets and hardware are also included. The 13.5" Pro is designed to fit most 17” or larger wheels.