Pour in a hot beverage of your choice and watch as your favourite BT21 characters appear from the black. When cold, this adorable BT21 Heat Changing Mug features the BT21 logo and the character VAN. However, once hot, the vibrant colours shine through and the rest of the cute gang appear on a bright blue background. This mug is a fantastic gift for BT21 fans, makes a great present, and is ideal for use at home or at work. Hand wash only. Do not microwave.