Approximately 888 pieces of 18 gauge vivid turquoise anodized aluminum jump rings with an inside diameter of 4mm. This size can be used in the following chain maille weaves: Double Orbital and Roundmaille. You can also use it with 18 gauge 6mm for a Helm chain maille weave The options are endless. Jump rings are made in the U.S.A. with American Wire Gauge (AWG) wire.