Fisher Space Pen is the utmost reliable writing instrument used by all trades. Our pens write in extreme temperatures (-30 to +250), under water, at any angle - even upside down, over oil and grease, and three times longer than the average pen. Our pens are the pen of choice for any military contractor, outdoor enthusiast, trekker, angler, hunter, law enforcement, construction worker, or anyone who demands reliability and dependability in their job when using a writing instrument. Our line of bullet cartridge pens are the perfect gift for anyone and everyone. (less)