1. This ice tray cup is made of food grade PP material and PET, which is and can be frozen and reused. 2. Unique Design: This ice cube tray cup features rotating quick release of ice cubes. Just put the ice tray mold into the cup, rotate the cup body, and the ice will automatically fall into the cup. All ice cubes can be easily released in one second. 3. Stackable and space saving: All components of the ice tray cup, including lid, ice tray, base, rotating cup, and stackable ice tray. The ice tray comes with a lid to prevent other odors and help you save space. The compact size of the tray further helps to save space, 4. Easy to Clean: ice box has non-stick surface for easy cleaning. Lid Please DO NOT use dishwasher cleaning, just rinse with water before using. Easy refill and reuse. Please do not come into with high temperatures to avoid deformation of the ice box.