Makes 2.5 inch large ice balls, which are bigger than standard ice cubes and retain their temperature longer - which means you can effectively chill your drink without diluting it. Fill with water, ice balls will come out of the sphere ice ball molds in good shape. Made from 100% food grade silicone. Easy to clean and dishwasher safe. Leak-proof design can also prevent water from leaking out. Just fill the mold with water, freeze for a few hours and enjoy a new twist on cold, crisp refreshment.