Twin Power X-Stop Sintered Rear Brake Pads For Harley Sportster Features: Born from years of research and brake dyno testing, X-Stop sintered Brake Pads benefit from the latest in design and manufacturing technologies Crafted from a select blend of metallic and compound materials fused together resulting in greater heat resistance, longer pad life and increased performance over organic pads Engineered for heavy-duty use, sintered pads are standard on most O.e.m machines X-Stop pads offer powerful stopping force and an excellent feel for the most demanding of riders