The Fisher Space Pen Q4 is the only pen you'll ever need. The Q4 features 4 functions: Black and Red ink, a 0.7mm pencil and a stylus. See image 2 for full operation instructions. The ink cartridges in the Q4 are pressurized and write under nearly any conditions: -20 degrees Fahrenheit, 250 degrees fahrenheit, underwater, and even upside down! The Q4 has a tungsten colored body with silver cap, shirt clip & tip. Rubber comfort grip for comfortable writing. Comes new in box with warranty, operation instructions and order form (in case you wish to purchase additional ink cartridges).