Hawk Performance ER-1 (Endurance Racing) Motorsport Brake Pad Set. Specifically designed for high-performance endurance racing, the ER-1 compound offers superior modulation, consistent friction levels, and exceptional pad life under extreme thermal loads. This set is compatible with Wilwood 7812 and 7816 pad shapes. [Kit contents: 4-piece axle set, Part Number: HB542D.600, Compound: ER-1 (Org/Metallic)]. Ideal for club racing and professional endurance series.