Unlike many other companies, we believe that each brake system is different. A rear brake will not develop the same amount of heat as the front. Since this is the case, we do not use the same sintered compound for rear brake pads. The 1371 compound is a rear pad only application. It offers sintered performance but is more forgiving. Many riders do not use their rear brakes, but when they need to, we do not want any nasty surprises. Just great performance and feel. These pads still feature advanced ceramics in the compound which makes it great for the casual rider or the top level racer. Available for most popular street bike makes and models.