Titanium Threadless 4 Pronged Princess Cut Cz Top Is Made From Implant Grade Titanium Ti-6Al-4V Eli Astm F136 With 25G Durable Titanium Pin Designed To Be Practical And Easy To Use. Fitting All Sizes Of Pins And Bases In The Invictus Threadless Body Jewelry Line. Pin Size: 0.45mm X 4.7mm. The Low Profile Design Provides A Sleek And Modern Look, Perfect For Those Who Want A Subtle Yet Stylish Piece With Flat Bottom Which Allows The Top To Fit The Base Seamlessly.