Each magnet is approximately 1in(25mm) in diameter with a 3/4in(19mm)magnetic backing. Great to stick on a refrigerator, dry erase board, or other flat magnetic surfaces! Each is finished with a glossy Mylar protection layer, making them highly water and fade resistant! These magnets are stronger than the larger, thinner ones in my shop but I would still advise against sticking them on car exteriors or other curved surfaces. NOTE ON INTERNATIONAL SHIPPING: Due to new fees and rule enforcement by USPS, I can only ship items like this (Anything thicker than 1/4in) internationally under "First Class International Package" rather than the much cheaper "First Class International Large Envelope" like I wanted to previously. I apologize for the inconvenience, as this will have to be a substantial increase to the shipping fee but this is a cost that is unfortunately out of my control.