Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber.
Image is a Stock image. The item "Wossner 2.0 FORD Pinto OHC Non Turbo NA 91mm Forged Piston Set" is in sale since Wednesday, November 27, 2019. This item is in the category "Vehicle Parts & Accessories\Car Parts\Engines & Engine Parts\Pistons, Rods & Parts". The seller is "shopbhp" and is located in Sevenoaks, Kent. This item can be shipped worldwide.