General project: Manufacturing of audio equipment; Sales of electronic products; Research and development of electronic specialized materials; Rubber product manufacturing; Sales of rubber products; Mold manufacturing; Mold sales; Sales of audio equipment; High quality synthetic rubber sales; Manufacturing of synthetic materials (excluding hazardous chemicals); Research and development of new material technology; Import and export of goods; Technology import and export. (Except for projects that require approval in accordance with the law, business activities shall be carried out independently with the business license in accordance with the law)