Studex Surgical Steel 4mm Regular Size Ear piercing Earrings studs 12 pair Mixed Colors White Metal 12 Pair Mixed 4MM Colored Glass Foil Back Stones in a Birth Month Set Sold per Dozen (You get 1 pair of each Month) Comes with Butterfly Earrings backs, are grooved friction post for secure fastening. All earrings exceed all F.D.A / E.C requirements. Earrings are sealed and sterilized in individual packages. Earring Dimension: Regular Size 4.0 mm