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 or HB100 pad type. Billet aluminum hubs come assembled with premium bearings packed with Redline synthetic grease and billet aluminum dust caps. Rotors are pre-assembled with NAS high grade stainless hardware. All mounting brackets, stainless braided hoses and hardware are also included. The 11" SS4+ is designed just like Baer's larger systems, but in a smaller package for 15" wheels. | Rotor Size/Type: 11" x 1.020", 2-piece | Replacement Rotor Rings: 6910354 (Left) / 6920354 (Right) | Caliper/Piston Count/Mount Type: S4 / 4-piston / Lug | Replacement Pads: DR1-C | Minimum Wheel Size: 15" (Use template to verify fitment, link below) | System Includes: Calipers, Brake pads, Rotor & Hat assemblies, Billet aluminum hubs w/premium bearings, Billet dust caps, Brackets, Stainless braided brake hoses & mounting hardware | Notes: - Designed to be used with stock 1955-68 Chevrolet passenger car & 1963-68 Corvette spindles - Widens track by .900" per side compared to stock drums (55-69 Pass. Car) - Widens track by .900" per side compared to stock drums (63-68 Y-Body) | Applications: - 1955-68 Chevrolet passenger cars with stock drum spindles - 1963-68 Chevrolet Corvette (Y-body) with OE spindles (All)