Is Slytherin your House? Then this is your cup! The 16-ounce Harry Potter Slytherin House Crest Travel Cup is made of plastic and comes with a lid and straw. Hand wash only. Not dishwasher safe. Do not microwave. Cup measures approximately 6 1/4-inches tall x 4-inch circumference at the top and 2 1/2-inch circumference at the bottom. Straw measures approximately 9-inches long. Ages 14 and up.