The ice mold is made of premium silicon, with high elasticity, will not be deformed by kneading and freezing, easy to release, food-grade silicone material, BPA – free, and not easy to damage. The ice cube trays are based on the map of the United States, it is the perfect gift for any American. In order to ensure the buyer’s sense of use, the gap between the states is not large, which can reduce the excess crushed ice. The ice cube mold is also another cool geography lesson, which can get kids interested in states. It is also a different kind of teaching aid, suitable for teachers or geography lovers.