SWES 30mm Smile Whiteboard/Refrigerator Magnet 30pcs/Tub Display-Assorted Colors The diameter of magnet is 30mm/1.18inch,30pcs per tub.Including 8 blue,8 red,7 yellow and 7 green . Applicable to magnetic whiteboard, fridge, iron box and other iron surface Brightly colored, High quality and brand new. It can be used as a marker for the magnetic calendar,also can be used to fix paper on refrigerator or magnetic whiteboard. There is a low possibility that black magenets may be broken during transportation and leave little magnetic powders. Don't worry, you only need to clean out these powders with water. If the problem persists after cleaning, please directly contact us. We will surely take care of such cases. Away from a infant in case of swallowing it.