This system features the 4-piston, S4 caliper mounted to a 11.62" x .705" 2 piece slot, drill, zinc plated rotor and uses the popular HB540 pad type. Rotors are pre-assembled with NAS high grade stainless hardware. Mounting hardware is also included. The SS4+ Deep Stage system is the first drag race system designed specifically for heavy, fast cars that might also see street use. The SS4+ Deep Stage system fits most 15" and larger wheels. , , NOTE: This system comes equipped with a street compound pad that offers low noise and dust and are NOT suited for track use. Race compound pads are also available for track use, call for information., , | Rotor Size/Type:, 11.625" x .705", 2-piece, , | Replacement Rotor Rings:, 6910186 (Left) / 6920186 (Right), , | Caliper/Piston Count/Mount Type:, S4 / 4-piston / Lug, , | Replacement Pads:, 6070012 (Street), 6070012-S (Race) , , | System Includes:, Calipers, Brake pads, 2pc rotors, brackets, Banjo bolts & washers (does not include hoses). , , | Notes:, Designed to be used on 2015-18 Ford Mustang S550 Rear End., System weight - 28.1lbs., Does not have park brake., , | Applications:, - 2015-18 Mustang with OE rear knuckles and hubs (Does not fit GT350)