Tri-Lite Hydraulic Release Bearings weigh a mere 1.3 pounds. They are CNC-machined from billet aluminum and hard-coat anodized for corrosion and wear resistance. Tri-Lite Bearings can be ordered with or without a return spring, and there is no shimming required. Simply tell us which clutch system is being used in order to choose the properly sized piston for your application. Pistons available in .100" increments to work with a range of applications.