Moto-Master Nitro Series discs are the ideal OEM-replacement. They offer innovative design and performance enhancement according to Moto-Master quality standards. Made in Europe from specially hardened premium quality stainless steel. - NITRO discs allow for high performance braking while exhibiting extremely little wear. - Venting slots are integrated into the disc design to aid with cooling and cleaning of the brake pad contact surface. - For best performance we recommend using Moto-Master brake pads with the matching pad compound that best suits your type of riding. Rear Brake Moto Master NITRO