LT Metal Bonding Wire using high purity refined gold LT metals uses high purity AU materials of 5N(99.999%) or more to apply its over 30 years of experience in manufacturing bonding wires in various sizes used in a number of industries. ALL 2 PRODUCTS by lt-metal Bonding Wires SeriesGSW (Gold & Silver Alloy Wire)GBW (Gold Bonding Wire)