This Design for Living Set of 4 Coffee Mugs is ideal for the office, outdoors, in the gym, or at home. They are constructed of high-density polypropylene reusable plastic, which is very durable and will not retain odors or tastes. Two mugs are solid, one has an airmail theme, and the other has a coffee theme. Each comes with a thermo plastic rubber sleeve to keep your beverage hot or cold longer. The wide mouth design provides easy cleaning and can fit everyday sized ice cubes. Each mug holds 16 ounces. Dishwasher safe.