This system features the 4-piston, S4 caliper mounted to a 11", 2 piece slot, drill, zinc-plated rotor. The S4 caliper has D.O.T compliant dust and weather seals and uses the popular DR1-C pad type. Rotors are pre-assembled with NAS high grade stainless hardware. All mounting brackets, stainless braided hoses and hardware are also included. The 11" SS4+ fits most 15” or larger wheels.