This part of the Pentel collection is slowly growing. I just got in the PGM 0.3mm pencil which is a replacement for the one I loaned out and never got back. There are a few variations on these pencils and you could check at the leadholders museum but it appears that the website is down. I only paid about $40.00 for this PGM pencil because the cap is missing. The good price was worth it.
I think there s a 0.4mm PGM out there so the hunt continues. Add them to your collection.