Whether you are making earrings, or you have lost the backs to your favorite pair, these best-quality sterling silver ear-nuts are just what you've been looking for. These earring backs are not heavy in weight, they are just slightly larger and more sturdy. Measurements: Part against ear lobe is 5.7mm wide, 5.5mm tall. Earring back is 3mm thick. Will fit securely on any standard earring post. Marked .925 on each ear-nut. Quantity: 12 earring backs (6 pairs).