This 20 oz cocktail shaker includes a strainer for seamless pouring, as well as a shot glass on top to measure the perfect pour. To use, pour the ingredients into the shaker base, fill it with ice, secure the top, hold the shaker with both hands (one on each end) and shake vigorously in a horizontal motion over your shoulder. Imprint your company name and logo on the side(s) of these drink shakers to promote bars, restaurants, happy hour and more.