Sun's Tea(Tm) 20oz Ultra Clear Strong Double Wall Glass Mug With Big Handle for Beer/Iced Tea/Soda Ultra clear 20oz non-fragile double wall glass mug, designed for your everyday use, sturdy and durable. Made of ultra clear lead-free borosilicate glass, air insulated in the unique double wall struture keeps cold drinks cold and hot drinks hot for a long time Big Handle design makes it very easy and confortable to hold the mug with full glass of drink Dishwasher and microwave safe. High quality build, see warranty info in the manufacture web site