1,no rebound when bending 2,strong holding ability 3,no noise when swing 4,delivery on time 5,ISO9001 ItemsSC-901MaterialSpring wires & galvanized iron wireOD2mm-10mmLengthcustomizedThreadsno threadsSurfaceSilver plating,chromeplate,electrophoresis,baking finish etc.ColourSilver or blackDelivery time7daysPackingPlastic bag and cartonShipping termsDHL,UPS,TNT,EMS,FEDEX,etcPayment termsT/T,Western ...