Balanced axis. Center of gravity. HB lead. Ease-of-use commendation by Arthritis Foundation. Center of Gravity: The ultimate in balanced writing! Dr. Grip Center of Gravity Mechanical Pencil is designed with perfect weight distribution, translating pen-in-hand motion into a more comfortable, balanced writing experience. Geometrically contoured, wide double layer grip and balanced gripping axis reduce writing stress and alleviate hand fatigue. Features tough 0.7 mm lead that withstands writing pressure and resists breakage. Refill with Pilot 0.7 mm HB lead8PL7JHB-W. Made in Japan.