14Kt Threadless Hamsa with Synthetic Blue Opal Top is made of solid 14kt nickel free Yellow Gold with durable 316LVM ASTM F-138 Implant Grade Steel Pin designed to be practical and easy to use. Fits all sizes of pins and bases in our threadless body jewelry line. Opal: 2mm; Rise: 1mm; Width: 7mm; Pin Gauge: 25g