HXL gas spring company supply free custom made service before you place order.If you want to custom gas spring ,tell us the following information, the best is that you send a drwaing to our email: and tell us .1:stroke length 2: extended length 3: cylinder diameter 4: rod diameter Or if you have difficult get the above spec information, freely contact with us.we will give some advice to you.Mainly market USA,Poland, Norway,Tailand,Korea,Japanese,Ukraine,etc.Packing:(very strong)carton inside,plastic bag outside ,4 strong belt