Enjoy your favorite drink like never before with the JoyJolt Spike Double wall Colored Glass Cups! These 4 capacity double wall glasses are perfectly suited for a multitude of hot and cold beverages as well as desserts. Each glass is colored on the inside and 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 colored 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.Set of 4, 13.5 Ounce CapacityInside Colored Double Wall Insulated Glasses, ideal for hot and cold drinksTop quality Borosilicate glasswareDishwasher SafeMicrowave, oven and freezer safeDesigned in the US, Manufactured in ChinaBacked by Limited 1 Year Manufacture WarrantyBeautiful gift box to present as a gift for that special occasion