Made out of a double insulated glass design that keeps your drink at a constant temperature. The outer layer remains at a normal temperature with both hot and cold drinks. The high borosilicate glass is durable, light and suitable for everyday use. Each mug has a 310ml capacity and is suitable for cappuccino, tea, smoothies, beer etc. Take note that these mugs are not dishwasher or microwave safe. Material. High borosilicate glass Capacity: 310ml /11oz each Temperature range: -20 to 150°C Dimensions: 5.5cm x 8.5cm x 11.5cm Weight: 0.5kg Note: This product includes only the glass set, no other items. Due to different lighting and screen settings, the colour of the item may differ slightly from the picture. Due to manual measurement, please allow a slight difference in dimension. What's in the box? 6 x Double Wall Insulated Glass Mugs