925 Sterling Silver Post Earring Backing Clutch style post earring back, there is a silicone insert inside which grip the wire post. Best fits 21 gauge (0.76mm) wire post. Quantity: 1 pair Style: F413 Size: 5.5mm x 4.5mm Material: 925 sterling silver Marking: 925 If you need a different quantity, please let us know and we can make a listing for the quantity requested.