Superlight Alloy Semi-Metallic disc brake pads Sram Avid Elixir Models, Elixir 9, 7, 5, 3, 1 Elixir C, R, CR, CR Mag Sram XX, XX WORLD CUP, XO, XO Silver Organic Semi-Metallic Compound / Alloy Back Plate Elixir Models, Elixir 9, 7, 5, 3, 1 Elixir C, R, CR, CR Mag XX, XX WORLD CUP, XO, XO Silver Not Suitable for "TRAIL" Model Brakes