Sun's Tea(tm) 16oz Ultra Clear Strong Double Wall Insulated Thermo Glass Tumbler Highball Glass for Beer/cocktail/lemonade/iced Tea/coffee, Set of 2 (Made of Real Borosilicate Glass, Not Plastic) Set of two Sun's Tea 16-ounce double wall glass tumbler. Made of lead-free high quality borosilicate glass. (not plastic) These double wall glass tumblers are designed for your everyday use, sturdy and durable, passed freefall ice ball impact test from 12 inches height. Insulated tumblers keeps cold drinks cold and hot drinks hot,the outside surface always feels comfortable in hand. The Ultra Clear double walled glass tumblers are perfect to use as clear coffee mugs (and thermal coffee mugs), glass beer mug , juice glasses etc. Dishwasher and microwave-safe. 6 month manufacture warranty.