All-in-one writing instrument features a multifunction design that combines the smooth writing of a ballpoint pen and the unique features of a mechanical pencil in one unit. Easy-to-use slide mechanisms on the barrel allow you to quickly change colors. Metal clip holds securely to a shirt pocket briefcase or purse. A large white vinyl eraser is housed under the cap for quick complete erasures. The Dr. Grip 4+1 is commended for ease-of-use by the arthritis foundation. Comfortable latex-free grip is perfect for students office workers and business professionals.