These Zero/Sports Circuit Brake Pads were designed for use with the Zero/Sports 4-POT Brake caliper kit. These brake pads will ONLY fit the Zero/Sports 4-POT brake caliper kit; they will not work on any factory calipers.These circuit pads were designed with performance in mind. They were developed to provide a strong resistance to brake fade under repeated hard breaking. Zero/Sports Circuit Brake Pads are made of an asbestos-free carbon ceramic compound with an optimal friction coefficient of 0.47 at rotor temperatures of 825 degrees Celsius.