12 pairs of mixed 4mm coloured glass foil back stones in one birth month set; sold by dozen (you will receive 1 pair per month); Supplied with butterfly earring backs, grooved friction pins for secure attachment. All earrings exceed all FDA/EC requirements. Earrings are sealed and sterilised in individual packaging. ;Earring Dimensions: Regular Size 4.0mm Studex Surgical Steel 4mm Regular Size Ear Piercing Stud Earrings 12 Pairs Mixed Colours White Metal 12 Pairs Mixed 4mm Coloured Glass Foil Back Stones in a Birth Month Set Sold Per Dozen (You will receive 1 pair each month) Comes with butterfly earring backs and features grooved friction pins for a SecSec. All earrings exceed all FDA/EC requirements. Earrings are sealed and sterilised in individual packaging. Earring Measurements: Regular Size 4.0mm