A two-piece can made with DWI (drawn and wall ironed) can forming method invented in the U.S. in 1958. It has been widely used in Japan since 1971. DWI can is made from aluminum or tinplate coil sheet which is drawn into cup shape and then wall-ironed into a can shape with several stages of wall ironing process. It is mainly used for beer and carbonated soft drink (CSD) and for some aerosol products. The can bottom is dome-shaped to withstand internal pressure, and the entire can body surface can be printed. The can forming method takes advantage of the ductility of metal, enabling the sidewall to be as thin as 0.1 mm and the can weight to be lighter than 3-piece cans. Especially in the case of aluminum DWI can, its sidewall can be extremely thin and the total can weight can be very light. Recently, there have been more beverage cans with smaller diameter ends.

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