1.Material: zinc alloy 2.The shell adopts hot forging process, the internal grains are refined, and the corrosion resistance of the parts is greatly improved. 3.The product surface has been polished 6 times of buffing, and the polishing part ensures no visible defects. 4.Product surface treatment : using thickened PVD plating, with strong corrosion performance 5.Cleaning Notes: cleaning the surface with mild soap water, and then thoroughly wipe the entire surface with a clean soft cloth.