... alloy 2. polishing, plating, oxidation 3. ISO9001 4. om352 mercedes-benz piston rings om352 : Specification: Material Cast iron / Ductile cast ... oxidation, phosphate, and etc (we can do as customer's request)Certificate ISO9001:2000 Application Saloon car, mini car, ... production. Packing Standard export packaging or according to customer's request. if no requirements,we offer the Corrugated ...