Clicker Astral

16G Titanium F-136 ASTM
Clicker Ring Curved, Bezel set, Cubic Clear Zirconia
GAUGE :16g (1.2mm)    
DIAMETER: 5/16" (8mm) and 3/8" (10mm)  
Titanium is usually preferred over steel because it contains no nickel and it weighs almost 50% less than steel.