This oval synthetic Opal curved barbell with a Prong Top is made from tarnish resistant Genuine Argentium Sterling Silver Settings and a 316LVM Surgical Steel Shaft. The Bottom Setting is permanently attached to the Curved Barbell so you won't lose it. This piece is available in 5 different opal colors so that choice will be up to you. This is an Internally Threaded Curved Barbell as are most of our pieces.