Gold filled means real gold mechanically bonded to a brass core. Gold filled items contain at least 1/20th of their total weight in gold, hundreds of times thicker than gold plating. Jump rings are a basic requirement for jewellery making. They are metal rings with an opening that you can twist open, and close tightly using 2 pairs of pliers or our jump ring tool. Use them to simply attach a clasp or a charm. These sterling silver jump rings are high quality for a professionnal finish. Perfect item for your jewellery making.