Centerforce(R) steel flywheels are manufactured from high quality billet steel. This High Inertia billet steel flywheel helps the engine maintain RPM's in rough terrain. Billet steel flywheels are available for popular import and domestic vehicles, including trucks. Centerforce steel flywheels are CAD/CAM-designed and CNC-machined from billet steel for precise, no-hassle, bolt-in installation. Centerforce billet steel flywheels are SFI-certified, so you know that you can count on them, on the street and on the track.