G Project - Panel lining! An easy yet effective way to give your models that extra bit of flair. Here are some of the more common options: 1) Panel-lining Gundam Marker (スミいれ用)

Enhance your Gundam Builds with Gundam Marker Panel Lines

Panel lining is a small detail that makes a huge difference. It's

This is felt tipped or other porous-tipped pens and markers.

Gundam Marker Extra Thin Type for Panel Lines Set (Renewal)

Panel Lining for Gunpla 101 - Gunpla 101

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The Gunpla Panel Lining: Gunpla's Guide to Markers and Paints

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Gundam Marker Extra Thin Type Gray for Panel Lines (Renewal)

HOW to PANEL LINE a GUNDAM, GUNPLA Tutorial