The Dr. Grip G-Spec is ergonomically designed to reduce fatigue. The weight of the pencil is concentrated near the center of gravity, resulting in the optimal weight balance. This means that the small rotating motions the pencil goes through while you write are easy and comfortable for your hands. The special double-layer grip features a harder outer layer with a soft inner layer, giving you the perfect softness and providing stability while writing. The pencil also features a layer of air between the rubber grip of the pencil and pencil body to allow a heat cooling effect, dispersing heat from fingers to keep hands cool even when you’re under pressure. Lead can be extended by simply shaking the pencil up and down! There is no need to let go and re-grip your pencil every time you need to extend lead. The conventional method of clicking down on the cap works too.