1,seven years experience 2,Doing many tests before mass cargo 3,help customer analysis and develop the products Iphone metal arm : ItemsTJ-IS-047MaterialSpring wires & galvanized iron wireOD8mmLength560mm/customizedSample time3-5 daysSurfaceSilver plating,chromeplate,electrophoresis,baking finish etc.Colourwhite or customizedDelivery time7-15daysPackingPlastic bag and cartonShipping termsDHL,UPS, ...