The KURUTOGA series of mechanical pens that keep the lead spinning and rolling. Features: The lines are not thick so you can write fine text, even with the same thickness of sharp leads can be written thinner than traditional sharps. Kurutoga engine rotates slightly by bit, so the lead is worn 360 degrees evenly and the text will not grow even after continuing writing. The gear holding the core will spin up and down with the pressure of the pencil. The rotation of the wick can be seen by rotating the mark printed on the gear.