Approximately 47mm gunmetal kidney ear wire components. 21 gauge. Plated brass. Kidney ear wires hook completely shut which allows you to make extra-secure earrings. After attaching drop, use round-nose pliers to crimp loop closed. This keeps your drop in place. You can also string beads directly onto the wire (a French wire keeper, Bead Bumper or small crimp will hold beads in place when wire is opened/closed).