Official Mr. Hobby/GSI Creos Gundam Marker set, produced to paint gunpla models representing green or red Zakus (suitable for any gunpla, anyway!).
GM34 - Char Pink;
GM35 - Char Red;
GM36 - Zaku Dark Green;
GM37 - Zaku Light Green;
GM38 - Phantom Gray;
GM39 - Zeon Gray.
Ink is alcohol-based, permanent and dries quickly. Obviously, it's particularly suitable for gunpla plastic parts. In case of mistakes or smudges, it can be wiped away using rubbing alcohol or the GM300 Gundam Marker Eraser (sold separately). If you need to color small details, you can push the tip of the markers in a small dish to let the paint flow out and then apply it with a thin-tipped brush.
Gundam Markers are produced in exclusive by GSI Creos and constitute a practical, fast and funny method to color gunpla models or add details.