These Brass open Oval Marquis Jump Rings are made in the USA. Outside diameter approx. 17.8x7.3mm, with 14 Gauge (1.6x2.6mm thick) Using Half round wire, these jump rings are ready to be plated, or if you prefer, use them as is for an antiqued effect. These have not been tested and therefore, may contain lead. Not recommended for use in children's jewelry.