EBC Brake rotors are assembled with our patented Square Drive button system further extending rotor life and braking performance. This further reduces the unit weight by up to 300 grammes.
X rotors feature full circle, circular rotor blades. XC rotors feature a contoured lighter weight profile. Both Floating MC rotors feature mill hard stainless steel high friction rotor blades for maximum brake effect and are the direct size for size replacements for OEM rotors. Both designs are also true fully floating units, offering more inside to outside float tolerance than any other rotor on the planet. Do not confuse floating rotors with rotors that feature loose rotors blades or buttons.
You should not be able to move either the buttons or rotor blades from side to side, if you can, it is highly likely that pad "Knock Back" will occur and you will end up with spongy brakes. Float means outside to inside heat expansion ability.That is what EBC X and XC rotors deliver and no other rotor can.