GUNDAM REAL TOUCH MARKER GM401 GREY 1. These are water-based (grey 1 color) paint to apply realistic looking grime and shades to your plastic models come with two tips size, a fine and a larger tip to have better coverage painting area. It is easier to clean up than traditional fine-tipped Gundam Markers with just an ordinary eraser. If you are going to turn your Gunpla models into an "after war" or weathering effect, you won't regret having these in your modeling toolbox!