1. Professional manufacture battery springs. 2.ISO9001,We ... Our facilities have been designed to expedite your battery spring requirements. We manufacture from your drawings, ... spring available in No.1,No.2,No.3,No.5,No.7 battery. MaterialPiano wire, ... stainless steel, High Carbon Steel, Nickel Plated, Phosphor copper Bronze, Copper Bronze, Beryllium Copper.Wire Diameter0.1 ...