Excellent Quality: The surface of the magnets is triple coated with nickel-copper-nickel. The solid metal surface protects the magnet from breakage, which greatly extends its lifespan. Perfect Size? Powerful Magnet: Product size: 24 pieces? 12x16 mm. Each neodymium magnet can hold up to 20 sheets of A4 paper on a metal surface (only 10 sheets of A4 paper on a whiteboard). Widely Used: Ideal for attaching paper, photos, cards, and notes to various metal surfaces such as refrigerators, whiteboards, aluminum shelves, etc. Also suitable as a hook for hanging keys, etc. [Not suitable for magnetic glass or magnetic glass boards!] Easy to Grip? Move: The extremely easy-to-grip tapered handle makes it easy to attach or move the magnets. Packed in a portable storage box to better store your magnets. I have never lost a magnet! Warning: ? Not suitable for children under 3 years old. There is a risk of suffocation due to small parts that can be swallowed. KEEP AWAY from patients with pacemakers