copper spring 1.Material:copper,tin bronze, phosphor bronze 2.Wire Dia.:0.01mm-5mm 3.ISO9001 certificate. 4.We can do OEM. copper spring1.Material:copper,tin bronze, phosphor bronze2.Wire Dia.:0.01mm-5mm3.ISO9001 certificate.4.We can do OEM.5.Applications: Automotive, medical device, electronics, toy,etc copper spring