Material: stainless steel/titanium 

As you can see, you can custom its gauge/thickness, ring’s inner diameter, ball diameter.

For some special custom dimensions,would need to charge a little extra, if this happens,will contact you.

Features of titanium:
In same volume, titanium is about 60% of the weight of stainless steel
Non-magnetic and non-toxic
Excellent corrosion resistance, will not rust ever
Outstanding biocompatibility, will not cause allergic reactions
Recognized as the best body piercing material