Large (neodymium) magnets are extremely strong and able to securely hold up to six sheets on the surface of a magnetic, glass surface whiteboard and up to 15 on a standard surface whiteboard. Use the magnets to display photos, reference materials or anything else that you need to see at eye-level. Character Types: Magnetic Pins/Tacks; Character Style: Circles; Character Mounting Type: High-Energy Magnets; Number of Pieces: 6.