Strong magnetism adhesion.
These high strength magnets are strong enough to hold up to 5 photos or more than 20 pieces of A4 paper per magnet that will not slide down easily on metallic surfaces. Please note that magnets do not stick to non-metallic materials such as wood, glass, plastic, textile, concrete, etc. However, many non-metallic surfaces may have metallic properties so that these magnets stick to them.