The unique body patterns on these Pilot Opt ballpoint pens mimic herringbone fabric, pink stone, silvery stardust, and other interesting materials. They're great as office gifts or party favors! Their many functional features include a sturdy spring-loaded clip that secures your pen to your notebook, pocket, or bag. According to Pilot's testing, it can clip 100,000 times without breaking. The rubber grip has a soft surface that is very comfortable and provides good grip. The ink refill is extra long, containing approximately 45% more ink than typical ballpoint pens. Good thing the grip is comfortable, because you might be writing for a long time! One black ink is included, and refills are available in additional colors.