Hard, break-resistant and smooth writing Giga Strong Lead It firmly sticks to the paper surface, so it is resistant to abrasion. Stein graphite is a size that is easy to hold on to uneven surfaces of paper, and it collapses to a thin and uniform surface of the paper. High manufacturing technology black smoke makes the notebook less messy. Unbreakable strength The frame supports from the inside, so it is hard to break. The case can be used to remove the core. Mechanical pencil refill; Lead diameter: 0.02 inches (0.5 mm); Lead color: RD (red lead); Lead length: 2.4 inches (60 mm); Number of leads: 20.