Centerforce aluminum flywheels are manufactured from aircraft-grade billet aluminum for lightweight and low inertia. Centerforce aluminum flywheels also feature mechanically retained starter ring gears as well as replaceable steel friction surfaces that have been heat-treated for abrasion resistance and long life. These flywheels are CAD/CAM-designed and CNC-machined to deliver perfect, no-hassle, bolt-in installation. Centerforce aluminum flywheels are available for popular domestic, import, cars and trucks. Centerforce billet aluminum flywheels are SFI-certified, so you know that you can count on them, on the street and on the track.