Use the 4mm copper 20 gauge open jump rings for attaching all sorts of components to your jewelry designs. This small jump ring features a bright copper gleam that would work well in designs featuring other copper components. Their 4mm size makes these jump rings versatile supplies you can use in a variety of designs. Use them to attach charms to bracelets, finish a jewelry strand or to attach dangles of beads to designs. Jump rings can be used in many ways, so stock up today.