Closed jump rings: Stainless steel closed loops are sealed, no welding. You only need to use your fingers or tools to string the desired jewelry together, which is very convenient to use. Material: These jump rings are made of alloy, durable and not easy to fade. They are great decorations for your DIY products. Easy to store: These jump rings are all packed in a plastic box, which is convenient for storage and carrying. You don't need to worry about mixing or losing the round jump rings when you go out. Wide range of uses: These open jump rings are widely used to make DIY crafts, beautifully decorated bracelets, anklets, necklaces, and used as jewelry, etc. Product size: The diameter of the jump ring opening is 3.89.3mm, 612mm long, 11.2mm wide, and 1618 gauge. These common sizes can help you complete most jewelry or handicrafts.