These medium dome plastic button cabochon magnetic earrings are a 18 mm x 25 mm teardrop. They have a really nice red, pink and silver floral and leafy pattern and each may look a little different, but I will match each pair as closely as possible. They are held on the ear with two 13 x 2 mm enamel painted ceramic magnets for complete comfort. They are sold in pairs. Available in pierced with surgical steel posts and nickel free backs. 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.