Fidanza Lightweight Aluminum Flywheel Nissan SR20DET S13/S14. Fidanza flywheels are made from the highest quality 6061 T6 aluminum. The material is very strong, heat dissipation is improved, and the weight is greatly reduced. The friction surface used in this flywheel is made of 1050 steel which makes it incredibly strong. This flywheel weight just 11lbs each and features replaceable friction center disc and pressure plate dowels.