With great holding power, they hold items tightly onto the refrigerator or white boards. Shaped like fly, they’re very easy to handle, to pull off and reposition. It will not leave any marks or on the surfaces. It uses great quality ABS, very . Great for holding printer paper, notes, photos, posters and cards on whiteboards, fridge, bulletin boards, magnetic map,calendars, lockers, file cabinets and other magnetic surfaces.