Perfect U-Shaped -- The curved u-shaped design can securely cradle the bead cord in place and effectively protect the bead cord from wear from clasps and other sharp-edged components during daily use, it is the perfect finishing end for use with jewelry bead wire 925 Sterling Silver -- Our wire guards are made of 925 sterling silver with fine workmanship, which is lightweight and polished for a smooth surface, sturdy and durable for you to use, can ensure a durable base for your jewelry creations Package Included -- 40pcs sterling silver wire guardians in 2 classic colors(gold and silver, 20pcs/color), enough quantity for your spare and application in daily life. Each wire guard measures about 4.5mm/0.18 inches in length, 4mm/0.16 inches in width, and the hole is about 0.6mm How to Use -- Simply thread the wire gardian through the loop of the lobster clasp first, then feed the beading wire in from one side of the gardian and out the other side, finally pull the wire tight to fit the wire to the wire protector Wide Applications -- These U-shaped thread protectors can be used to cover the knots at the end of earrings, bracelets and necklaces, and can also be used to make keychains and handbag accessories, etc