This is the same flywheel we sell with our clutch kit.  We take a stock LUK dual-mass flywheel and all of its vibration-absorbing and smooth-shifting capabilities and lighten it by nearly 10 pounds!  We also machine down the center lip to ensure compatibility with the Sachs organic performance clutch.  Finally, we balance the flywheel to within one gram.  When purchased with our clutch kit, the flywheel is balanced with the Sachs heavy duty pressure plate (which is not very heavy, just slightly more than stock).  But for those who just want the lightened flywheel, this is it.