Boston style double tins cocktail shaker, made of premium stainless steel with solid, durable for high. Two-piece construction, small one come with 600ml(8.3x6.3x11.2cm), big one come with 700ml(8.6x6.3x12.7cm). You can easy to prepare and mix drinks, no leak once fits properly and chill faster. Perfect for making beverages or alcoholic drinks, tequila, alcohol, espresso martini, iced coffee. best choice for bartender and mixologist