Swissstop avid xo trail disc brake padshigh performance kevlar ceramic brass and resin composite material provides excellent brake power with minimal effort at the brake lever performance is consistent in both wet and dry conditions and pad life is excellent featuresfits avid x0 trail elixir trail sram guide serieshigh quality springs are supplied with every set of swissstop disc brake padssupplied as pairs for one wheelbuy swissstop components from chain reaction cycles the world