With this double-sided mechanical pencil, you'll always have two colors at hand. A twisting mechanism is used to extend lead. This pencil has 0.9 mm green lead and 0.9 mm red lead. The pencil comes with one piece of lead in each side, and refills are sold separately.
Pencil dimensions: 5.9 inches long, 0.3 inches diameter (15 cm long, 0.8 cm diameter)