Finally, an easy method for making clear ice balls!  Cloudy ice is caused by ice freezing from the outside-in causing air to be trapped within the ice.  The Clearsphere system uses a directional freezing method to control the direction that water freezes, pushing all the air out of the ice ball. Makes two (2) 2.5 inch ice spheres Molds are BPA free and dishwasher safe  Stackable 5 piece system Includes silicone ice ball mold, insulated freezing chamber, and integrated ice ball storage box.