Harry Potter Muggle Worthy Heat Change Mug mermaid So big it's almost a

So big it's almost a kingdom all by itself

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I'm irresistible to any Marvel collection

riding his Nimbus cloud

Suitable from 12 months+

Harry Potter Muggle Worthy Heat Change Mug mermaid So big it's almost aWhen cold this mug is completely Muggle worthy, no magic to be seen. However pour in your tea coffee and watch the magic happen as a creature appears through the keyhole. When cold room temperature: blank keyhole under the text "muggle worthy" When hot drink added: creature eye appears in keyhole and text disapears Official Harry Potter Licensed Merchandise (Note: whole mug does not change colour picture depicting two colour variations)