Copper products are made of pure copper or copper alloy as the main raw materials of daily necessities and industrial supplies. Copper is a kind of tough, soft, ductile, purplish red and lustrous metal. One gram of copper can be drawn into 3000 meters long filaments or pressed into almost transparent copper foil of more than 10 square meters. Pure copper has high conductivity and thermal conductivity, second only to silver, but copper is much cheaper than silver.