Truckerco Sintered Metallic Sram Avid Elixir Models, Elixir 9, 7, 5, 3, 1 Elixir C, R, CR, CR Mag Sram XX, XX WORLD CUP, XO, XO Silver Sintered Metallic Compound / Copper Back Plate Elixir Models, Elixir 9, 7, 5, 3, 1 Elixir C, R, CR, CR Mag Sram XX, XX WORLD CUP, XO, XO Silver Not Suitable for "TRAIL" Model Brakes