Enjoy your favorite drink like never before with the JoyJolt Serene double wall glass cups! These 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 of time, while keeping your hands cool to the touch. Borosilicate glass is a heat-resistant glass that is perfectly suited for hot and cold drinks. While borosilicate glass is naturally lighter than traditional glass, it is stronger and more resistant to temperature changes and scratching. They are also dishwasher, microwave and freezer safe. Double wall glass allows your hot beverage to remain hot for a longer period of time while keeping the outer glass cool to the touch. Your cold beverages will remain cool inside while the outer wall remains free of condensation. The optical illusion of your suspended beverage can also provide a new look to your favorite drink! Details:Clear7.4 oz. capacitySet of 4 glassesShatter resistantEasy to cleanDishwasher, microwave, oven, and freezer safe (up to 350°F)Made from borosilicate glassBacked by a limited 1 year manufacturer warranty