SET OF 4: The ice ball molds come in a set of 4, stackable to save space, and can be combined in 4 colors to suit your needs. AIRTIGHT SEAL: These unique ice cube molds ensure leak-proof freezing and create flawless ice balls every time. Simply pour water into the mold, freeze, and enjoy. SLOW MELTING: Our molds create slow-melting ice cubes, ideal for chilling and garnishing whiskey, water, iced tea, and other beverages, creating the best cold drinks. The ice balls melt slowly and evenly, keeping drinks colder longer and reducing dilution. SAFE MATERIAL: Our ice ball molds are made of food-grade silicone and plastic, BPA-free, and very durable, so use them with confidence. EASY TO CLEAN: Our ice ball molds are very easy to open and can be washed by hand or in the dishwasher.