Engineers, crossword enthusiasts, and people solving Pi by hand will love the unique mechanics inside this mechanical pencil. Every time you lift the Roulette pencil, a special spring loaded mechanism rotates the lead. This brilliant feature ensures a consistent, smooth, and fine line every time you write. No more splintered lead or inconsistently wide lines when you go to write!

Takes .5MM lead refills.

Eraser is also refillable!