These are advertising magnets that are delivered to your mailbox. There are 45 magnets of various sizes. In addition to their usual use, how about using them for your children's science projects or craft activities? There are no other noticeable stains (I have checked, but there may be oversights in small details). These are personally owned and stored at home, so please consider this as well. #WaterSupply #Magnet #JunMiura #HikaruIjuin #ColdAd