Kokuyo Two-Way Color Marker Mark + is a marker that can be used in two ways: line marking and extra-fine memo writing. Since the inks are of similar colors, you can make clear markings despite the two colors. The line marking uses an ink color that is hard to flicker and the letters below are easy to read, and the ultra-fine pen uses an ink color that is easy to read even if the line is thin. The gray color of the extra-fine pen is a modest gray color, so you can leave the contents of the board and write supplementary notes.