Official Harry Potter Hogwarts Crest. Be the house Captain of your favorite house from all the houses in Hogwarts with these amazing Mug and Bowl set. This magical Harry Potter mug features black background and Ravenclaw, Slytherin, Gryffindor, Hufflepuff crest on front, which features Ravenclaw- Blue, Slytherin-Green, Gryffindor-Red, Hufflepuff-Yellow Colour Inside.