We only used safe food grade material to produce the 1.5 oz Mini Plastic Barrel Shaped Shot Glasses with Hook.This 1.5 oz Mini Plastic Barrel Shaped Shot Glasses has a hook to hang itself onto other wine glasses.You can make your own flavor of cocktail while drinking beverages by adding a 1.5 oz Mini shot glass of wine in.The hook on the shot glass is wide enough. It can be hanging on different glasses or cups with different thickness and shape.It is useful and helpful.It is a disposable plastic shot glass with hook for one time use.The shape of the barrel is very special.It's ideal for theme parks, parties, birthday party, anniversaries, graduation parties, beaches etc with your own logo or brand printed. It is cost effective to use at parties for for events.