gas spring 1)material:steel,nylon. 2)finish:spay paniting 3) ... .0mm 4)Loading weight:50N,80N,100N,120N,150N,200 Gas suppor, Air spring,apply to supporting wooden door,aliminum frame ... 's request. Packing:1)1pc/poly platic bag2)one piece gas support and 6 screws put in one poly bag,then ... 20 gas supportput into one inner box,then 5 inner boxes put into one carton box ...