This marker can easily express dirt and blurred paint with a realistic touch.A water-based wipe-off type is used for safety.Equipped with two types of nibs, fine and thick.GM400 is a pen for blurring already painted GM401-410.Use it to blur the boundary surface.If the nib gets dirty, clean it with a tissue.If it becomes difficult to remove the dirt, use a new blurring pen.This is felt tipped or other porous-tipped pens and markers.