Gundam Marker alcohol based paint series in Gundam Mecha Gray colour with angled flat edge tip.
Of the two gray markers available, this one has a slightly bluer hue than the other one! That makes it more mechanical, we suppose.
GM13 Mechanical Gray Gundam Marker
gundam marker - Panda Hobby
Gundam Planet - GM13 Mechanical Gray Gundam Marker
Gundam Models Discussion Thread [Archive] - Page 79 - AnimeSuki Forum
HELP ME] Bi-Weekly Q&A thread - Ask your questions here! : r/Gunpla
Paint Marker — Panda Hobby
GSI Mr.Hobby GM13 200 Gundam Marker Mecha Gray Angled Flat Edge Tip 4973028935936 – OEShop
HELP ME] Bi-Weekly Q&A thread - Ask your questions here! : r/Gunpla
Gundam GM13 Mechanical Gray Marker : Arts, Crafts & Sewing
Gundam Planet - GM13 Mechanical Gray Gundam Marker
Gundam Marker GM-19 Gundam Meta Violet (Angled Flat Edge Tip / Alcohol Based Paint): Kikatek UK