Gold filled round Snapeez® jump ring in an 8mm size. This is the outside dimension. The wire is 16ga and measures 1.3mm thick. "The snapping jump ring" is a special piece. You use it the same way as a regular jump ring but this piece has been designed with a "snap" to help keep the jump ring closed. You CAN open the ring again. The guage of the wire along with the added benefit of the snap closure makes for a very durable finding for your projects. There is a substantial discount if you buy 5 or 10 packs due to larger than normal inventory.