These magnetic earrings are a beautiful new color of Swarovski crystal called violet. These faceted crystals are set in a solid non plated brass setting. They are held on the ear with a comfortable magnetic field created by two magnets so they don’t pinch like the old fashioned clip on type earring. They will most likely be the most comfortable earrings you’ll ever wear. You can also wear them higher on the earlobe like a cuff earring. They have a neodymium magnet in front and a 1/4th inch x 3 mm mild ceramic magnet in back. Sold in pairs. Need extra or stronger magnet backs? They are listed here: https://laurawilsongal.com/products/extra-magnetic-earring-and-eyeglass-holder-backs If you have misplaced your metric ruler, remember that 13 mm=1/2 inch. Remember: The wider the magnets, the more comfortable the earring is. If you are allergic to nickel, order only earrings that have both enamel painted ceramic magnets front and back since the neodymium magnets are plated with nickel.