can't read?
Cobalt is a chemical element with symbol Co and atomic number 27.
C 7347(OTTO) Cobalt sputtering target, diam. x thickness 25.4mm (1.0in) x 1 mm , 99.9% Cas 7440-48-4 - used in electroplating for its attractive appearance, hardness, resistance to oxidation it is used as a base primer coat for porcelain enamels.