The Indexpen is an ergonomically designed pen for use by individuals with grasping, upper extremity or fine motor disabilities or arthritis. Indexpen is designed to facilitate one finger writing and fits on any finger. The ink cartridge with ballpoint can be mounted on any finger, eliminating the need to grasp or squeeze the pen. The natural weight of the hand is sufficient to apply ink to the page. Ink refills are available. COLOR: yellow, green, pink, blue.