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. Measurements: Part against ear lobe is 4.7mm wide, 3.7mm tall. Earring back is 2.5mm thick. Please note: these are too small to fit standard ear posts. They are considered fine in size and work on slimmer posts only. Marked .925 on each ear-nut. Quantity: 12 earring backs (6 pairs).