... 3.ISO9001-2000certificate 4.accept small order Compression Spring1)Material:50CrVA,60Si2MnA,70,T9A,65Mn,etc2)wire diameter:as customers' requirement3)spring ... extension spring,compession spring,torsion spring,and in shape,include coil spring,belleville sping,leaf spring,flat spring,ring spring.6 ... Denmark and win favorable fame from all of our customers. Coil compression spring