RP-X Is Designed For Peak On-Track Performance; Leading To Higher Brake Dust And Noise,EBCs 2-Piece Floating Brake Discs Are Made From Top-Quality Materials For Road Or Track Use,EBCs 2-Piece Discs Offer Weight Savings Over OEM Parts And Cost-effective Long-Term Maintenance,Outer Friction Rings Are High-Carbon G3500 Alloy For Durability And Crack Resistance,Patented SD-Drive Bobbins Allow The Braking Ring To Float; Reducing Stress And Preventing Warping,Compared To RP-1/RP-X Offers A 25 Percent Higher Friction Coefficient And A More Positive Initial Bite,RP-X Is Not R90 Homologated For Public Roads In The Eu But Is Safe For Driving To Motorsport Events Where Allowed