Product features: Interesting Christmas calendar: 24 kinds of rocks, gems, and mineral specimens (may contain the same stones or stones not shown in the picture). Every day, there are different surprises, forming a lasting attraction for children. the Ultimate Specimen Collection: The perfect standalone collection or add to any Childs specimen collection, including 24 rough and polished ore samples. It is a great gift for boys and girls. Time concept: Geology is more exciting than breaking rocks and finding crystal treasures; calendars are also a great way to teach children about numbers, time concepts, and the art of patience. Parents can also give their children extra surprises on designated dates. The perfect gift: children and adults like this gift. Note: Not edible. Please do not put it in your mouth, it is not suitable for children under 3 years old.