Large (neodymium) magnets are extremely strong and able to securely hold up to 6 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: Magnets; Mounting Type: Magnetic; Character Color: Clear; Material(s): Neodymium.