This magical mug is coloured black and made up-side-down, making it even more fun to drink your favourite potion out of! This decorative mug would make the most-unusual and quirky addition to any Halloween display. This cool mug is decorated with golden starts and letters that read ‘The Leaky Cauldron’, making this wonderful mug a cracking addition to an existing Harry Potter collection. This fantastic mug measures H12cm x W14.5cm including the handle and comes packaged in a decorative card box. © Please do not copy text. Avena product description – Harry Potter Large Black Leaky Cauldron Mug.