TC KLINE Racing Lightweight Flywheels are all Billet-aluminum for improved performance and drastically reduced M.O.I, made in the USA. OEM clutches bolt on for easy installation, high tolerance manufacturing to insure a perfect hassle free installation. Highest quality materials like 6061-T6 aluminum for the flywheel, treated steel for the heat shield and OEM quality starter ring gears, one year limited warranty.