ADULT ONLY OVER 21 YRS !! The ThinkGeek Build On Brick Shot Glasses set includes four pieces, perfect for hosting a party gathering. These multicolored shot glasses are made of glass and plastic, serving cold beverages. The original set from ThinkGeek features a unique brick-building design, adding a fun and interactive element to your barware collection. Ideal for serving 4 guests, these shot glasses are a quirky and stylish addition to any home.Enhance your drinkware collection with the Build-On Brick Shot Glasses. These multicolor shot glasses are perfect for adding a playful touch to your gatherings. Enjoy the vibrant red, blue, yellow, and cream colors that make each piece unique.