I purchased these for hanging up keys and odds and ends. They are so useful and easy to apply anywhere. They are about the size of a dime and come with double sided sticky pads so they can be affixed to any smooth surface. I am using these in my office by my desk to hold my staple remover. I am using one in my bathroom to hold my extra tooth brush heads for my sonicare since they are magnetic and before I was just leaving them on the counter. With these I can neatly store my extra toothbrush heads and it keeps them clean and neat. I am also using a couple right by the front door. These little magnets are so strong and even hold my huge keyring. I am very happy with this purchase and will surely get more.