8.0 mm, Satin/Polished Design, Polished/Ridged Edges, with Comfort Fit.

Tayloright© Tungsten is a permanently polished product so durable that it is guaranteed to hold its shape and shine indefinitely. Tayloright© Tungsten  ...  the most durable Tungsten rings to date, the best tungsten rings in the world. 

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

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