– A water-based pigment ink that has little bleeding and does not show through even when written on paper. It is water resistant and can be used safely for mail. It can be written not only on paper but also on metal, glass, plastic, etc., and has no unpleasant odor.- Fine round core (line width 1.2 to 1.8 mm) / Bold square core (line width 6.0 mm)- 15 color set : black, red, blue, green, yellow, soft pink, light blue, brown,purple, orange,yellow-green, ocher,gray, purplish red, light orange