One side of this threadless titanium nipple bar is fixed, and the other side is threadless, which means you could mix and match front-facing tops if inclined It comes in four different colored bezel-set gems - clear cubic zirconia, purple opal, blue opal, and white opal. The pin on the threadless side stays in place due to pressure from a slight bend in the pin. The pin is pre-bent. Manufactured from high polish implant grade titanium (Ti-6AL-4V-ELI ASTM F136) and sold as single pieces. Bar: 14g 9/16", 1/2", 5/8".