The 16 oz.Guzzle Buddy® Wine Bottle Glass is made from borosilicate glass and uses a 100% silicone sleeve that screws gently into most bottles to provide a perfect seal. No Spills and No Mess. Pouring wine is such a chore! Simply screw the glass into your favorite bottle. Aerate, pour and drink in one easy step. It makes drinking from the bottle CLASSY... or just plain FUN! Because, who wants those "Looks of Judgment"? The Guzzle Buddy® Wine Bottle Glass is a HILARIOUS GIFT for wine lovers or anyone who wants to be the "hit" of the party! It's FREEZER SAFE, so now you can enjoy an icy cold, frosty glass! Hint: Did you know this glass fits in beer, soda and cider bottles too? CLEANING IS EASY. Just put it in the dishwasher top rack overnight, and it’s sparkling clean the next morning. Add some class to drinking straight from the bottle, just... Plug It and Chug It!!® *THIRD PARTY TESTED AND TRUSTED SAFE. Made from the highest quality BPA and Lead free strong borosilicate glass and 100% LFGB certified food grade silicone.