The Pilot Dr. Grip Pencil is an easy grasp pencil designed for use by individuals with grasping disabilities, carpal tunnel syndrome, or arthritis. This mechanical pencil has a soft, wide cushioned grip and an eraser. Lead and eraser refills are available. DIMENSIONS: Fits leads with a diameter of 0.5 or 0.7 millimeter (mm). COLOR: Barrel is black (0.5 mm) or blue (0.7 mm).