[925 Sterling Silver]: Double loop jump rings are made of 925 sterling silver, strong and hard, good corrosion and durability, bright color not easy to rust or fade. [20Pcs Jump Rings In A Box]: Comes with 20pcs open loop rings: 7x1mm, inner diameter: 5.5mm. All storage in a plastic bead containers: about 6.8x5.2x1.1cm. [Double Ring]: The open loop ring is designed with two layers of metal split ring, which closes firmly, and the rebound closes tightly, the attachment will not slip off the ring, easy to open and fasten items, providing extra security for your jewelry making projects. [Wide Usage]: Split key rings are widely used in many diy craft projects, beautifully decorated bracelets, anklets, necklaces, etc. It is also great for key chains, hanging cards, other decorations, crafts and jewelry making. [Best Gift]: Using double loop jump rings to make some delicate handicrafts as presents to your family members and friends on Halloween, Christmas, Thanksgiving, New Year, etc.