XIANQI Color Silver Material Neodymium,Paper,Glass,Nickel About this item Where Durability Meets DesignStronger but smaller than other brands, easy to fix in the narrow metallic surface. 11mm x 13mm, 12 Pcs in the package. Each powerful magnet holds up to 22 sheets of paper on any metallic surface.[NOT suitable for glass magnetic board!] Strong Fridge MagnetSuitable as jewelry hangers, hardware or garage tools hangers, key holders, or kitchen utensils organizer. Perfect for holding printer paper, photos, posters, and cards on whiteboards, fridge, bulletin boards, magnetic maps, calendars, lockers, file cabinets, and other magnetic surfaces. Designed to AttachPush pin shape design for magnetic-absorbing force, high strength glue. whiteboard magnets will not leave any dirt on your refrigerator, bulletin board, or maps, easily attach or remove. All in One Shape Made of neodymium material, 3-layer (Nickel + Copper + Nickel) Triple-coated and heavy-duty industrial grade magnets make you easy to grasp and attach on your whiteboard.