Centerforce aluminum flywheels are manufactured from 7075 T-6 aircraft-grade billet aluminum, with shrink-fit ring gears that also have mechanical retention. These flywheels are CAD/CAM-designed and CNC-machined to deliver perfect, no-hassle, bolt-in fitments with no modifications, in combination with either Centerforce clutches or other clutch assemblies built to OEM specs. They're available for popular domestic and import vehicles, including trucks, and are SFI-approved.