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. Every jewellery project deserves a perfect ending. As a stunning focal piece, a hidden closure or something in between, clasps are an integral part of every design. Lobster claw clasps are self-closing, streamlined clasps. You need a jumpring or splitring if you want to attach it to a loop. THESE METAL COMPONENTS ARE NICKEL FREE. Buy beads online with I-Beads.