By using ink with newly added resin and coating the front surface of the paper when writing, it seems that the back surface is less likely to bleed. Furthermore, the conventional red and green ink colors have been changed to bright colors that make the characters easier to read, and pink and blue have been added so that you can choose from four colors.
The pen is equipped with fine and bold types on both ends, and the bold pen tip uses a material that fits the paper surface. It seems that you can draw beautifully in places where it is difficult to draw lines, such as thick reference books and curved surfaces of dictionaries.
The price of a single pen is 150 yen. The "Check Pen-Alpha Set" with a check sheet that hides the marked characters is 210 yen (both tax excluded).