MelonBoat Bath Bomb Molds Fizzies DIY Set of 3, Cake Pan Molds 6 Hemispheres, (2-3/8", 2", 1-3/4"), Aluminum Create your own different-sized and different-flavored bath bombs at home and save money. The material is smooth and easy to clean using soap water. The molds can also be used to make chocolate, cupcake, jelly and pudding, or even to hold spices. NOTE: Do NOT hit the molds with metal spoon.