14Kt Yellow Gold Threadless with Bezel Set  Rainbow CZ 7-Cluster Top (Left Ear) 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.  The Pride Collection. Pin Size: 0.45mm x 4.7mm.