High quality stainless steel (420 2Cr13) ensure durable braking power. Heat treatment for the material avoiding warped. (HRC 36±2) 
Wave shape brake disc rotor, lighter than OEM. Scientifically designed holes for better heat dissipation. 
7.87" outer diameter, 2" inner diameter. Thickness 4mm. The type of mounting hole is 'Straight Bolt Hole'.