TRP Disc Brake Pad Material: [backing plate] alloy, [pad compound] semi-metallic Compatibility: Hylex RS PM, HY/RD, Spyre, Spyke, Parabox 2012 Recommended Use: commuting, cross-country, cyclocross, enduro, gravel, mud/sand/snow, road cycling, time trial, trail, triathlon Manufacturer Warranty: 2 years