Considerably lighter than a stock flywheelCAD designed, CNC machined, and computer balanced for quality and precisionTrouble free, one-piece construction allows cost effective resurfacing and eliminates problems associated with multi-piece designsMaterial is properly distributed on the flywheel for strength, greater heat dissipation, and reduced inertia; integral ring gear is induction hardened for maximum gear life90 day limited manufacturer's warranty; counterweight sold separatelyThis flywheel is forged from a chrome-molly billet. Heating the billet and impacting it with a large 5000-ton mechanical forge yields an ultra fine grain structure in the metal, making it the absolute strongest flywheel available. Following the CAD design to maximize the flywheel's strength, greater heat dissipation, and reduced inertia, this Streetlite Xact flywheel was then CNC machined and computer balanced for quality and precision. It is lighter than stock flywheels, so you get the improved throttle response and acceleration that street and drag racers prefer, but it still retains enough inertia for reasonable drivability. ACT offers properly balanced counterweights for this flywheel, which are sold separately.