Standard Shoes: FS rated, higher rating than O.E.M. shoes for better stopping power. Grooved Shoes: FG rated, high friction grooved linings, efficiency improves with heat, for wet and muddy conditions. Listed with suffi x G X Series Black Coded: Carbon Graphite/ Kevlar® compound for all around performance. Listed with suffi x X R Series Bronze Coded: Sintered metal pads for extreme wet and muddy conditions. Listed with suffi x R MXS Series: High friction HH-rated sport motocross sintered brake pads. The MX-S is a high per for mance race pad with superb durability similar to that of the R range of pads but with a slightly higher friction level and fade resistance and diamond ground surface fi nish to speed bed-in. Add MX to end of part number.