Moto-Master Flame Brake Disc 112046 Flame discs are made from hardened and refined chrome-molybdenum alloy steel Material guarantees extremely little rotor wear and high-performance braking Flame discs are precision lasercut, CNC-drilled and surface-machined for perfect fitment and flatness Venting grooves in the contact surface are designed for efficient cooling and disc cleaning to evacuate water and mud Discs are surface coated with a 10 micron zinc plating to help protect them against weather influences