Enjoy your favorite drink like never before with the JoyJolt Spike Double wall Glass Cups! These 4 capacity double wall glasses are perfectly suited for a multitude of hot and cold beverages as well as desserts. Individually handmade of heat-resistant borosilicate glasses, they are designed to keep your liquid hot or cold for a longer period, while keeping your hands cool to the touch, it also eliminates need for coasters as no messy condensation will occur. JoyJolt double wall glasses are mouth-blown by expert artisans using borosilicate glass. Borosilicate is stronger than traditional “soda-lime” glass and can be used for everything from drinkware to cookware. Due to the natural properties of the boron particles, the glass is held together tighter, resulting in a stronger, lighter glass. Borosilicate glass doesn’t need to be as thick as traditional glass to be just as strong due to the bonding capability boron oxide.Details:Clear13.5 oz. capacity4 glassesDishwasher, microwave, oven and freezer safeBorosilicate glass