These insulated coffee mugs are cold and heat resistant. Made of high-quality borosilicate glass, they can withstand different temperature levels without cracking. So you can use them for hot and cold drinks. At the same time, because it has a double wall, it can provide insulation and keep your drink warm longer than a regular glass. Best of all, these insulated coffee mugs protect you from getting burned because they keep the heat inside the first glass wall. Perfect for tea, coffee, latte, espresso, cappuccino, macchiato, smoothies and juices. It’s a perfect addition to your breakfast and afternoon teatime. Features Handcrafted from high-quality glass by skilled artisans. Transparent, odorless, non-polluting, non-toxic and safe to use. Dishwasher safe, but hand washing is recommended. Microwave safe. Freezer safe. Product Details Set Includes: 4 Double Walled Coffee Mugs Item Dimensions: Ø3.54" x 4.57" H Item Weight: 0.6 lb Capacity: 11.4 fl-oz.