6.3 mm, 14 kt. Gold Inlay , Ridged, Polished, with Comfort Fit.

Tayloright© Tungsten TCT is a patent-pending, exclusive formula created by blending Tungsten powder and Titanium Carbide powder resulting in a permanently polished product so durable that it is guaranteed to hold its shape and shine indefinitely. Tayloright© Tungsten TCT ...  the most durable Tungsten rings to date, the best tungsten rings in the world. 

Tungsten TCT rings are 10 times harder than 18 kt. Gold, 5 times harder than tool steel, and 4 times harder than Titanium.

Tayloright© Tungsten TCT rings carry a Lifetime Warranty, Lifetime Sizing, and 30-day Return Policy.