Representing the U.S. Military, the 400 series pens are all brass & steel construction, variety of colors and finishes & tungsten carbide ballpoint tip
The 400 series bullet space pen is the original Fisher ball point pen & most popular Fisher pen sold
Pressurized thixotropic ink cartridges are hermetically sealed & write 3x longer than ballpoint pens
Reliably performs in extreme temperatures (-30F to +250F), underwater, in zero gravity, at any angle
Designed to easily fit on your pocket or purse when closed and when open, it's a full sized, evenly balanced writing instrument