Uncompromised durability; reduced driveline slop compared to dual-mass; Heat-treated forging for strength and toughness, induction-hardened ring gears for maximum life;One piece construction provides an efficient heat sink for the clutch and less chance of failure. Eliminates troublesome dual-mass design, warped inserts or loose ring gears; Recommended for street and off-road use; Forged, CNC machined and dynamically computer balanced for smoothness and reliability