We use these tumblers for water, juice or gin -- or a combo of all three, just sayin'...
Borosilicate glass contains boron trioxide which allows for a very low coefficient of thermal expansion. loosely translated, this means it will not crack under extreme temperature changes like regular glass. Its durability has made it the glass of choice for high-end restaurants, laboratories and wineries. They are crystal clear and will add sparkle to your drink of choice.
Borosil, based in Mumbai, is the world's premier manufacturer of borosilicate glass.
3" diameter, 3" h