The collection of product raw materials is far higher than the industry production quality inspection standards, and the major materials are all listed companies in the industry. It has a perennial strategic supply relationship with well-known suppliers in the sheet metal industry: Shengyi Technology, Kingboard Technology, and Jinan Guoji. Copper materials are purchased from Jiangxi Copper Group, and tin raw materials are made of Yunnan tin. The procurement of raw materials is transparent and the quality is guaranteed.