(Wossner Piston specs) In-house designed and manufactured; all forgings are produced in Wössner's company-owned forging operation Lightweight pistons with the tightest piston-wall clearances in the industry give you a quieter running engine.Piston made with high quality, permanent skirt coating to reduce friction and piston rock for quiet and improved performance 4032 T6 Forged Aluminum Alloy German Engineered from Wossner’s own designs and forgings Use FEA (computer simulation) to fine tune every designT6 Heat Treated for Heat Resistance & Durability for High- Load Use.