If you are new to Gunpla then I suggest you use this pen for panel
Panel Lining for Gunpla 101 - Gunpla 101
A Comprehensive Guide on Panel Lining - Make Your Gundam Kits Look Bet
How to Make Your Gunpla Models Stand Out with Panel Lining – LA
Panel lines - Highlighting using a graphite pencil - Scale
For Bandai MG 1/100 Unicorn Gundam Model Gatling Machine Gun Belt Bullet Chain. For Bandai RG HG 1/144 Origin Gundam Zaku Gatling Machine Gun Weapon
For Bandai Gundam Mr.Hobby Gundam Marker Pen Fine Tip For Panel Line GM01 Model
First time panel lining has worked for me (First image). how can I
G Project - Panel lining! An easy yet effective way to give your
HOW TO PANEL LINE YOUR GUNPLA
Gundam Marker: Extra Fine Tip (Solid Panel Lining)
Made my first attempt at very basic panel lining with a Gundam
First time adding panel lines and other details : r/Gunpla
The Gunpla Panel Lining: Gunpla's Guide to Markers and Paints
Panel Lining for Gunpla 101 - Gunpla 101