Pre-Verto race-weight flywheel with drive straps and high strength bolts installed. Fitted with 107-tooth ring gear for use with early-style inertia starter. The latest refinement of the ultra-light Mini flywheel is made symmetrically to reduce harmonics vibrations. Made from EN24 Billet steel for reliability but weighing only 7.9 lbs. EN24 has excellent wear and shock resistance, and is a stable, high-strength alloy steel.