Excellent magnetism: each neodymium magnet is super strong. Each cone magnet can hold multiple images. You can connect them to refrigerator, whiteboard, cards, etc. Its mini size does not hide any important information. Not suitable for glass magnetic plates and glass plates Premium quality: the powerful neodymium magnet is coated with three layers: nickel, iron and nickel. This protects the magnets from corrosion and significantly extends their durability. Diameter : 12mm. Height : 16mm. These small magnets have smooth curvature and shiny appearance, have a good decorative effect. Wide application: you can attach this extra strong neodymium magnet to note board, typing board, school board school, desk, classroom bulletin board, etc. The neodymium magnet can be wrench/some small tools,etc. Caution: Risk of choking caused by small parts that may be swallowed. Keep PATIENTS away from those magnets with heart pads or defibrellators! SAVE SPACE: Contains 18 snap pen magnets and a small box which is useful and doesn't take up too much room to stand firm. They have a beautiful, easy-to-grip shape, much easier to separate than round magnets. Satisfaction Guaranteed: If you are not satisfied with the magnet, please contact us. We will reply to you within 24 hours, promise full refund or replacement with a new product and give you a satisfactory answer.