This needle minder is made with extra strong rare earth magnets which allow needles to easily adhere to the surface of the minder. These magnets are dangerous and strong. They should be kept away from children and pets. This minder comes with a second magnet and we recommend to slide it from surfaces versus pulling the magnets apart. The magnet on the back of the piece has been epoxied on with the strongest epoxy I could find. Please refer to the photos. Thank you!