12 Pair Mixed 4MM Colored Glass Foil Back Stones in a Birth Month Set. Each stone is set in sterilized surgical steel. All earrings exceed all F.D.A / E.C requirements. Earrings are sealed and sterilized in individual packages. Comes with Butterfly Earrings backs, are grooved friction post for secure fastening. Sold per Dozen (You get 1 pair of each Month). Earrings are plated in 24K Gold.