The Morning Glory Mach 3 is a disposable roller ball pen with a fine 0.38mm tip. The Mach 3 writes with a crisp and clean line but it is not very smooth. The ink is neither waterproof nor archival safe. There is an ink level window on the pen body and the grip is made of a translucent plastic that lets you see the feed. I like that the cap snaps onto the body when posted. The look of this pen is pretty mediocre and the clip has rough edges that gives an air of cheapness. At $2.00 the Mach 3 is well priced but for a little bit more you can have a much better pen such as the Pilot Hi-Tec-C and the Otho Graphic Liner.
Here are some other reviews of the Mach 3:
(I have no affiliation with the sites linked below)