Perfect Gift For The Family !! Build a large variety of shapes and figures with this highly creative magnetic toy. Material: NdFeB Metal Color: multiple colors Each small Ball Diameter: 3 MM PackingIron box This product is the ball is excellent technology, it is not easy to fade after using. Can stand Long-lasting friction and strong Antioxidant ability. This ball passed the SGS safety test. WARNING: Small parts. Not suitable for children or anyone under the age of 14. Do not put in nose or mouth. Swallowed magnets can stick to intestines causing serious injury or death. Seek immediate medical attention if magnets are swallowed.