Harry Potter Crest Hufflepuff Gryffindor Ravenclaw Slytherin - Set of 4 Coasters 1/4 inch thick Very High Quality Harry Potter House Colors - Great Gift for Harry Potter Fans Harry Potter Crest Hufflepuff Gryffindor Ravenclaw Slytherin - Set of 4 Coasters 1/4 inch thick Very High Quality Harry Potter House Colors - Great Gift for Harry Potter Fans Set of 4 Coasters Each Coaster is 4 x 4 in diameter and 1/4 inch thick They also have a genuine black rubber (not foam or cork) base for a non-slip finish.