... .3,120,000 times quality guarantee.if you want ,pls let us know the parameters .specifications:Usage: tool box,machinery,shopping cart ... .Features: 1, Gas: Nitrogen filled inside. 2, Color : black,silver,or as clients request. 3,Quality: ... days after deposit.Shipment: We can accept your appionted forwarder. high quality gas spring for machinery,tool box,shopping cart