... Item nameExtention springItem numberES001Material availablecarbon steel wire, stainless steel wire, spring steel, brass, aluminum, copper, alloy, etcSurface treatmentpolishing, ... 35 daysPayment term: 30% prepaid before production, the balance should be paid before shipment. other payment terms can ... .6.Deliver the goods after receiving the balance. 2012 Customed Bright Good elasticty pullback spring