These reusable metal ice cubes are freezer safe and function as real ice cubes, keeping your beverage cold due to the non-toxic gel inside. Just freeze 1 hour before use and add these non-diluting ice cubes to your drink. Includes 4 cubes in a protective, hinged, storage & travel case. They are made of food grade, BPA free materials that meet FDA requirements. Hand wash recommended. Case is clear plastic, ice cubes are silver metal. 2.50" W x 2.50" H (case), 0.75" W x 0.75" H (cubes)