Writes in all environmental conditions. Writes on coated paper and plastics. Writes through water and underwater and in extreme weather conditions. Not affected by dirt grease or cold weather. NASA selected the Fisher Space Pen for use on all of the Apollo missions. They are still used on manned flights into outer space today. Cited as an outstanding example of industrial art the classic design of the Fisher Bullet Pen has been exhibited for years in New York Museum of Modern Art. The Bullet's timeless styling has been the topic of many art books and magazine articles and continues to to our most popular pen. Seen in the Guinness World Records as "Most Versatile Pen". The Fisher Space Pen continues to write in the rain and all other weather conditions. Used by canoers hikers campers golfers fishermen snowmobilers and many other outdoorsmen.