Bath Letters and Numbers–Munchkin®. Kids love to learn everywhere... so why not in the tub? Twenty-six floating letters and numbers come in six colors to provide endless opportunities for a delightful learning experience. When the shapes are wet, they stick to the tub wall to spell names and places or add numbers. The foam is soft, durable and non-toxic. So splish, splash, when they're taking a bath... throw in a little learning, too.