Bike brake pads are compatible with Sram Guide RSC VS R RS. Compatible with Avid XO Trail, Elixir 7 Trail, Elixir 9 Trail disc brakes. Disc brake pads are made of copper based sintered metal, good heat resistance, easy to install and long lasting performance. Sintered metal brake pads handles high temperatures and resists brake fade so power lasts longer. Higher friction braking than semi metallic and organic pads ,Superior stopping power in all weather conditions, and longer pad life. Metal disc brake pads are better in extreme conditions like mud, water and where there are gritty, sandy trail surfaces. Note: Please compare size and shape with your original brake disc before purchasing. Please check and replace brake pads regularly. B.