Palm's Zinc Ball Anodes 2" are made of a special high grade of zinc metal containing a minimum of 99.99 % Zn and weighing 1 lb each. They are designed for use in the surface finishing industry. The zinc metal melting and casting process is carefully controlled to prevent iron pickup and the introduction of other impurities. Palm's Zinc Ball Anodes 2" are made to demanding specifications and are subjected to stringent quality control standards and testing.