7030 Cartridge Brass : Sunraj Industries exports 7030 Brass Sheet, Strips and Foils which is also called Cartridge Brass, Spring Brass and Spinning Brass. 7030 Brass have excellent ductility and strength, and are the most widely used brasses. These alloys have the distinctive bright yellow colour normally associated with brass. They have the optimum combination of strength and ductility in the copper zinc alloys, coupled with good corrosion resistance.