... a year 5,OEM welcome N-2 lock gas spring Xiongfeng is a leading manufacturer of Gas Spring in China with 10 years ... , maintenance free3, surface finish: Nickled-plate, chromed-plate, powder paint, oven paint, Galvanized, oil anti-rust, etc.4, material: steel, aluminium ... International Quality System Certification of SIRA International Authentication institute. N-2 lock gas spring