Its wide and shiny and solid.  The inside is a bit convex which is my preferred comfort fit style, perfect for wearing on the thumb because you can slide it over the knuckle easily to where it rests, where your thumb is naturally concave.  You want your thumb to still have its range of motion when bending and with this being 11mm wide you will.  There are similar rings 15mm wide but I feel like Id need longer thumbs, not sure so I may try one to see. I like the fit of this 11mm ring.  It looks great as a middle finger ring as well, although any wide ring on the middle finger will tend to hit against your other rings depending on how many rings you wear and their width.  The only trifling counterpoint to make with this ring is that the edges aren't rounded; this doesnt take anything away from the ring or its feel once on my thumb.