Our aluminum flywheels are made from the highest quality 6061 T6 aluminum. The material is fantastic for strength, heat dissipation and of course reduction in weight. The friction surface we use is an incredibly strong 1050 steel. The plates are milled to meet our high specifications. A Fidanza flywheel can mate with any type of clutch material, including organic, kevlar, ceramic, metallic and sintered iron. We attach the friction surface with military grade aerospace fasteners. The ring gears we use are also made from 1050 steel and are heat treated for durability. The gears are heated then pressed on and secured with grade 8 button screws. We were the first to utilize a stepped dowel system in most of our flywheel applications. This doweling method ensures that once the pressure plate is installed the dowels cannot be removed because they become locked into place. Fidanza designs and builds flywheels with extreme precision. We give tuners, racers and builders the high performance and unmatched power they’re seeking. Specs: 6061 T6 Billet Aluminum Grade 10 Aerospace Fasteners Exclusive Stepped Dowels Replacable 1050 Steel Friction Surface 1050 Hardend Ring Gear CNC Machined at Constant Surafce Speed.