Question re: the Sierra Vistas.
It seems to me that they use the same sleeves, but the pen is fatter.
This leaves more room for your material, right? You don't need to turn the material down to a real thin dimension for the pen, right?
If this is true, it's a pretty good idea. I've found that acrylics don't always work great with Sierras, simply because they become transparent that thin. Even if you paint the tube, it's not always ideal.
Do I have the right idea here? Same diameter tubes, fatter pen, which leads to not so tight turning of the material...correct?