Product Description 1>Tension Spring with wire diameter from 0.1 up to 20mm; 2> made of carbon steel, piano steel, SST, alloy steel, iron, plated steel etc. 3> generally used in telecommunication, medical instruments, optical equipments, Power supply, switch, computer peripherals etc. 4> first-class quality and customer designed shapes; 5> packing with inner plastic bags/inner cartons/ outer carton;