This is the Gundam Real Touch Gray #3 Paint Marker by Mr. Hobby.
, Color: Yellow 1, Useful to create realistic stain or smudging effects., Water based ink for plastic kits
Mr. Hobby Gundam Marker: Real Touch Marker Yellow 1 (GM409)
GM-406 Real Touch Marker - Gray 3
GM406 Real Touch Gray 3, GSI : Arts, Crafts & Sewing
Mr. Hobby® Gundam Real Touch Marker GM406 GREY 3 DARK GRAY
Mr. Hobby Gundam Marker: Real Touch Marker Gray 3 (GM406)
Mr. Hobby - Real Touch Gundam Marker Gray 3 (GM406)
GSI Creos Mr.Hobby Gundam Marker GMS112 Real Touch Marker Set 1
Gundam Marker - Twin Heads Real Touch GM406 (Gray 3)
Mr. Hobby Bottles/Markers
GSI Mr Hobby, Paint Marker Gundam Marker Real Touch Set 2. rcMart Hobby Store ships worldwide.
Gundam Marker Real Touch Set 2
Mr. Hobby Gundam Marker: Real Touch Marker Gray 3 (GM406)