The Quaffer double bubble layered shot glass beer quaffer is a fun and interesting new way to party and will certainly spark some conversation at your next event. It works because liquor is less dense than beer, so the liquids naturally want to separate. The hourglass shape of the glass (and a correct pour) allows the liquids to separate. Simply pour the alcohol on top against the inside of the glass (not directly into the bottom chamber) and the top liquid will sit perfectly on the bottom beer and remain separated until consumed. This allows for the most unique shot experience you will ever have as you will immediately taste the beer following the alcohol. Do your Boiler Maker (shot of whiskey dropped into a glass of beer) in one easy step, with no lag time in between. No more mess from dropping shot glasses into pint glasses. Experiment with different Quaffer Recipes, there are tons of great ideas! Rise to the challenge and take down the whole thing. Made of plastic for greater durability, this set of 4 quaffer shot glasses feature a patented design that allows you to have both the shot and chaser in one. Although the Quaffer is called many names, such as a double bubble shot glass, a snorkel shot glass, a jigger chaser shot glass, an over under shot glass, or a jagerbomb glass, this design is by far the most user friendly around. This package is the perfect combination for a fun party or celebration. Specs: Dimensions: 3"W x 6"H. Capacity: 1 1/2 oz top section. 11.2 oz bottom section.