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What does the hardware include?

Date：2019-05-23 17:36:15

1.Gold: red and yellow precious minerals, international monetary standard

2. Silver: it is a kind of transition metal. The chemical symbol Ag. Silver is one of the metals known and used in ancient times. It is an important precious metal.

3. Copper: one of the earliest metals used by human beings. It is a metal in the earth's crust and oceans.

4. Iron: it accounts for 4.75% of the crustal content, ranking the fourth in the crustal content after oxygen, silicon and aluminum.

5.Tin: tin has been found and used since ancient times. In some of the ancient tombs in China, they often found some tin pot, tin candlestick and other tin ware.