This is felt tipped or other porous-tipped pens and markers.
GMS105 Gundam Marker Basic Set (Sets of 6)
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Use for inking to trace hollow lines. It g gives the model a three-dimensional feeling and makes it appear more realistic. The effect is stronger when you choose the color to ink according to the color of the model parts. In general, you can use black for dark parts, grey for lighter parts and brown for red parts.
Bandai Gundam Marker Black Fine Line
Gundam Marker
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Gundam paint marker sets - Arts & Crafts
Gundam Marker Extra Thin Type for Panel Lines Set
G Project - Panel lining! An easy yet effective way to give your
ガンダムマーカー gm300 消しペン