X and XC Floating Motorcycle Discs are the lightest brake discs you can buy, they will eliminate all your vibration problems and last longer than conventional rotors using round button technology. Both designs further reduce weight by using only six drive buttons. This further reduces the unit weight by up to 300 grammes.X-Series discs feature full circle, circular rotor blades while XC-Series discs feature a contoured lighter weight profileHand built and inspected to minute tolerances ensure the best quality is provided at all timesPatented square drive button system prevents warping and vibration under heavy breakingBoth X & XC Floating Motorcycle discs feature mill hard stainless steel high friction rotor blades for maximum brake effect and are direct size for size replacements for OEM discs. Both designs are also true fully floating units, offering more inside to outside float tolerance than any other rotor on the planet.