This product is mainly used for the food sealing and packaging. It shows the functions of good anti-rust and shock absorption of metal cans, which can meet the requirements of resistances to acid, sulfur and corrosion of packaging products after sealing, make food commercially sterile, and prolong the shelf life, so as to meet the product launch standards. This product belongs to the shaped expansion reinforced can, with higher production technology requirements and larger overflow water volume of empty can than the conventional metal can. Besides, the dumbbell three-piece can has personalized shape, which can be printed and decorated on the outer surface of can body for purposes of improving the aesthetic appearance of the product and promoting the product marketing.