the raw material used in the Zhang Fengzheng tannins is an old cloud tin with a purity of 99.9%, without adding any alloy components to keep the pure tin green metal from being destroyed. After melting, pressing, cutting, cutting, beating, shaving, welding, polishing, chisel, carving, copper decoration and so on, a fine and elegant tin device is presented to people. Wang Wentao, Secretary of the Ji'nan municipal Party committee, greatly appreciated the visit. The Ji'nan municipal government decided to take the tin ware of Zhang tie village as the representative of Ji'nan's Foreign Affairs gifts. It takes at least three days to make a tin pot, and it needs about 2 kilos of tin. I can make more than 100 a year. In addition to foreign gifts and personal orders, most of them are traded on the Internet. Last year, I sold 180 thousand, and Lao Zhang's face was full of pride.