Keep your designs together with the help of the 4mm 21 gauge matte black-plated open jump ring> this jump ring features a thin gauge and a small size. Use it when you want to add small details like a charm or a top-drilled bead to designs. You can link several of these jump rings together to create a cool chain mail design. Jump rings are the building blocks of jewelry designs, so make sure you always have some on hand. This jump ring features a soft black color with a matte finish.