Tovolo Sphere Clear Ice System Finally, an easy method for making clear ice with the Tovolo Sphere Clear Ice System! The perfectly insulated system creates a controlled environment where the oxygen is pushed into the bottom, classic sphere, leaving the top sphere crystal-clear and ultra slow-melting The clear sphere is sure to impress and wont dilute your favorite spirits while the classic sphere is perfect for your drink on the rocks or crafting cocktails in your Stainless Cocktail Shaker These molds create two seamless, 2.5" ice spheres - one clear and one classic and the sturdy base prevents tipping in freezer These molds are dishwasher safe