This system features the 4-piston, S4TL caliper mounted to a 11", 1-Piece slot, drill, zinc plated integral hub rotor. The S4TL caliper has D.O.T compliant dust and weather seals with a top load design for quick and simple pad changes. Rotors come with bearing races installed and premium bearings packed with Redline synthetic grease and new dust caps. 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.