Sales of metal materials, nonferrous metal materials and their powder products, rare earth products, 3D printing products, polymer materials and their products; Research and development of nonferrous metal materials and their powder products, polymer materials and their products; Metal material development; R&D and application services of 3D printing technology; Processing of non-ferrous materials and their powder products (limited to branches); Personalization of 3D printing (limited to branches); Manufacturing of forgings and powder metallurgy products (limited to branches); Smelting of common non-ferrous metals (limited to branches); Rare earth metal smelting (limited to branches); Non ferrous metal alloy manufacturing (limited to branches); Production of non-ferrous materials and their powder products (limited to branches); Quality inspection and testing services for metal products; Precious metal detection services; Engage in the following business activities on the Internet: wholesale of non-ferrous metals (excluding hazardous chemicals); Non ferrous metal retail (excluding hazardous chemicals); Retail of chemical products; Import and export of all kinds of goods and technologies independently and on behalf of others, except for the goods and technologies that are restricted or prohibited from import and export by the state; Technical services related to polymer materials and products; House leasing.