ProMatrix pad, rotor, and flexline upgrade kits offer measurable brake performance improvements to racers and enthusiasts using the OE factory brake calipers. High performance pad compounds are specially selected to provide increased brake response and higher resistance against fade. Two-piece directional vane GT rotor kits provide high temperature durability for the track. SRP drilled and slotted black e-coat rotor kits provide high-tech style with corrosion resistance for the street. Stainless steel braided flexlines add style, durability, and firmer response with reduced deflection under load. (-U kits do not containg pads or lines).