Hawk Performance ER-1 (Endurance Racing) Brake Pad Set. Engineered for consistent performance under extreme temperatures, these pads are ideal for endurance racing and high-performance track days. The ER-1 compound offers excellent torque control and pad longevity. This item is sold as a complete axle set. Included in the box: 4 x Front Brake Pads (Part Number: HB603.616). Fits vehicles equipped with the standard performance 6-piston front calipers.