(1.8L XRS (2ZZGE 6 Speed)) Built for the (05 and up) Toyota Corolla... Fidanza 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 used is an incredibly strong 1050 steel. The plates are milled to meet Fidanza'a high specifications. A Fidanza flywheel can mate with any type of clutch material, including organic, kevlar, ceramic, metallic and sintered iron. Fidanza attaches the friction surface with military grade aerospace fasteners. The ring gears used 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. Fidanza was the first to utilize a stepped dowel system in most of their 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, giving tuners, racers and builders the high performance and unmatched power they're seeking.Fidanza Flywheels help:Any street or race engine produce more usable horsepower!Any street or race engine lasts longer due to less stress on the crankshaft and bearings!