This is felt tipped or other porous-tipped pens and markers.
Add pizzazz to your plastic kits with these "Real Touch" markers, popular in Japan for shading and highlights! Water-based colours mean they're safe to apply over your paint job. This marker has two tips, one large and one fine, for accurate application. The "blurring" pen does not add colour but acts as a blender, softening marker lines on your plastic kits (and blending two colours if you've applied two).