can't read?
Zinc is a chemical element with the symbol Zn and atomic number 30.
Z 3574(OTTO) Zinc sputtering target, diam. x thickness 25.4mm (1.0in) x 1 mm , 99.9% - used as a galvanic coating on steel to prevent corrosion, and is used as a constituent of various alloy systems (e.g. with copper in brass).