They are approximately a 3" flower (+-) Each has a "rare earth" magnet affixed to the back. These are one of the strongest magnets you can find. These are flower magnets that can go in door or outdoor. If they go outdoors they will weather some more over time. If you like the tone of the rust, you can put a clear lacquer over it to maintain its effects. They are made out of mild steel. Glass has been added as a great effect for the center! Lots of colors to choose from.