Magnetic Earring Backs - 6mm Replacement magnetic earring backs are a customer requested item! Sterling silver magnetic disc backings work with all of our magnetic non-pierced earrings. Available in two sizes - small (6 mm) and large (12mm). Shop the small magnetic earring backs for light to medium weight earrings. Shop the large earring backs for heavier earrings and dangle or chandelier styles. Small earring backs are great for anyone with thin/small earlobes. Large earring backs are great