Nitro Series Brake Disc Attractive design, raceproven quality and competitive pricing make Nitro the perfect OEM replacement disc for most of your riders Like MotoMaster?as Flame discs, all Nitros are made of special hardened, lowcarbon stainless steel for optimal durability and maximum stopping power Design provides maximum heat dispersion while the carefully positioned cooling slots ensure optimal brake pad cleaning action in all conditions Designed and engineered by MotoMaster to meet the demands of modern Motocross and Enduro racing