Sakura SumoGrip Mechanical Pencils feature a specially designed, ergonomically correct contour that is a natural fit for hands. Recommended by physical therapists for carpal tunnel patients and adults with fine motor skill challenges, these pencils have a triangular-shaped grip that helps fingers feel relaxed and flexible. Each pencil includes a strong, no-roll pocket clip and jumbo twist eraser that lasts six times longer than an average pencil eraser. Sakura SumoGrip Mechanical Pencils are available in 0.5 mm and 0.7 mm sizes.