Double-walled mug, 2 pcs. Volume: 290 ml. Material: heat-resistant glass. Ideal for hot or cold drinks, preventing them from cooling down or heating up quickly. Not suitable for use in a microwave oven. It is recommended to wash by hand using mild detergents. Do not use abrasive cleaning agents or hard sponges for maintenance. Can be washed in the dishwasher on a gentle mode for glass