ProMatrix Rotor Caliper Relocation upgrade kits offer measurable brake performance improvements to racers and enthusiasts using the OE factory brake calipers. High strength aluminum relocation brackets increase caliper torque radius .Two - piece directional vane SRP rotors kits provide high temperature durability for the track. SRP drilled and slotted black e - coat rotor kits provide high - tech style with corrosion resistance, durability, and firmer response with reduced deflection under load.