The Ursa I pen is the basic Ursa pen.
I have made hundreds of these pens and had very little problems with them.
The Ursa I pen with Titanium gold plating and Koa wood from Hawaii
Ursa I customized pen with stabilized buckeye burl barrels and Titanium Gold plating.
For the last couple years, the majority of the Ursa I pens I have made are customized (modified) to minimized the black enamel parts and maximize the barrel materiel, either wood or acrylic. At the same time, this customization makes the diameter of the upper barrel slightly smaller.