The resins I use fall in to two broad categories, factory produced (both old/vintage and modern) and my own in-house custom resins.
Below is a selection of what I typically have available at any time but it is subject to change. Many of these resins are "vintage" or no longer produced so they do run out.
A warm, soft feeling material loved by pen makers and users alike. Often with translucent areas allowing a hint of what is going on inside the pen.
Original resins from the famous British company Conway Stewart. Timeless classics in a variety of colours.
Ceblox resins from the Italian company Mazzucchelli. Some of the most sought after plastics for pens due to the scarcity of them. This does mean they can be expensive to source which is reflected in the price of the pens.
Semplicita resins in a variety of vivid colours. Used in the making of my Mono models.