3-Bezel Set Cluster White Synthetic Threadless 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. Pin Gauge: 25g; Decoration Part: 10.5mm (L) x 5.5mm (W) x 5.5mm (H)