To reduce the frictional resistance between the pen tip and the paper, the corners at the tip of the tip have been eliminated to achieve a smooth writing feel. Moreover, the stainless steel tip with excellent toughness and the spring tip mechanism which prevents the direct current of ink are adopted. The ink composition has been reviewed to improve the smoothness while maintaining the vividness of the ink color and the ability to draw ultra-fine lines without bleeding. Uses a dark, non-bleeding water-based pigment ink. It also has excellent water resistance and light resistance. A new design with no noticeable joint between the grip and the shaft. The simple, smooth and flowing shape is attractive. In addition, the entire toe shaft has a rubber grip that is easy to grip.