Whether brought by an owl or not, the letter from Hogwarts is the key to becoming a student of the famous school of witchcraft. Never forget it thanks to this magnificent Harry Potter mug by ABYstyle! Every morning, you will now see your mug change appearance when you pour your hot chocolate, your tea or your coffee…! Discover our demonstration of the Harry Potter thermo-reactive mug on video! Features: – Changes appearance when you pour hot liquid. – Large capacity (460 ml). – Not microwave or dishwasher safe – Ceramic material.