Fine point marker for filling in the panel lines on plastic models. Over marks can be cleaned up with a normal eraser.
gundam makers
GSI Creos Gundam Marker Value Set -GM01&02&03- (Black, Gray, Brown)
Gundam Marker Panel Liner @ Impulse Hobbies
GUNDAM MARKER Ultra Thin Pen Point for Panel Lining (3 COLORS), GUNDAM COLOR /MARKER, PAINT / THINNER / SPRAY
Gundam Marker ~ Ultra Thin Pen Point for Panel Lining 劃線筆,勾線筆[油性]
GSI Mr.Hobby Gundam Marker GM01~03 Extra Fine Tip Panel Lining NEW RELEASE
Panel Lining for Gunpla 101 - Gunpla 101
Gundam Marker - Brown GM-303P (Sumi-ire Pour Type for Panel Lines): Kikatek UK
GKgundamkit
How different panel line markers hold up over time. : r/Gunpla
Hobby Mio - Panel Lining Pen (0.3mm) – Canberra Hobby Centre
Mr.Hobby Gundam Marker Liner/ Ultra Thin Pen Point for Panel Lining GM01 Black
If you're looking for the simplest way to panel line your Gundams and other model kits, look no further! Just draw in the panel lines with this marker
GM01 Black Fine Line Marker
These pour type markers are oil-based paint pens that are similar in use and effect to panel line wash. You can use these on either straight builds or
Gundam Marker Pour-Type Panel Liner (Select - Black, Brown, or Gray)
A Beginner's Guide to Customizing Your Gundam
Doing a panel line wash & Hi-Res Barbatos Part 2