... special engineering plastic,food grade plastic,never fade,stable,softy and antioxidant,UV-resistantIron piece : phosphatization,rust cleaned,polished, ... bolts,finished with electro-static powder coating.5).Steel rails and tubes cleaned by sand-blasting,then coated with electro- ... .6).Rotor moulded UV-resistant PE roofs,playing panels and slides(LLDPE).7).Stainless steel fixing accessories8).Player age ...