20pcs Authentic Sterling Silver Butterfly Earring Safety Backs Earnut Ear Nut 5.5mm Clutches for Stud Earrings SS175 Material: solid .925 sterling silver (925 stamped), silver is hypoallergenic material - good for sensitive ears Size: ~ 5.5mm x 5mm (~ 0.22" x 0.2") - Recommend to use these earnuts to medium thick earring wire, but it really depends on how much friction of the earnut and earrings you would like to have. Please make sure the size fits your need before placing an order. thank you color: silver Quantity: 20pcs=10 pairs Top Quality Sterling Silver Guarantee  All our sterling silver jewelry supplies is coated with a clear protective coating to help prevent silver from tarnishing  Hassle-free returns only if the purchase is made with Adabele. Adabele is a registered brand with the US Patent and Trademark Office. Other sellers with a new listing are not authorized by Adabele to sell this product. They are known to offer counterfeit, imitation products that are not authentic Adabele products.