Organic Semi-Metallic disc brake pads Sram Avid Elixir TRAIL, X0 Trail, Elixir 7 Trail, Elixir 9 Trail, Guide, Guide R , Guide RS, Guide RSC, XOTR-M, XOTR-O, XOTR-O-AL Organic Semi-Metallic Compound / Steel Back Plate "TRAIL" Model Brakes Sram / Avid Elixir TRAIL, X0 Trail, Elixir 7 Trail, Elixir 9 Trail Guide, Guide R , Guide RS, Guide RSC XOTR-M, XOTR-O, XOTR-O-AL