Features Filled gas: Nitrogen Color: sliver/black or as you need Surface: spray painting for cylinder, chorme plating for piston rod Warranty: 180000cycles Material: finishing rolling seamless steel tube for cylinder,steel for piston rod Quality: ISO/TS16949;ISO9001:2008 Operating Temperature Range: -15~+80ºc(5~176ºF)as standard; -50~+80ºC(-58~+176ºF) or-15~200ºC(5-392ºF)availale