Gem Balls 1.6mm.

These are externally threaded gem balls; therefore they screw onto a bar (opposed to internally threaded where they screw into a Bar). 

These Balls come on different thickness threads. (See alternative product for 1.2mm Bars attachments)

The bar thickness will be 1.6mm. 

There are many colours to choose from.

A Standard Tongue Bar, Belly Bar and Nipple Bar will be at a 1.6mm Thickness. All other piercings can vary.

These gem balls are cannot be used on a ball closure ring.