Fisher Space Pen Trekker Space Pen, Matte Black (725B) The trekker Space Pen comes with a carabiner and a break-away lanyard, making it easily attachable to a belt loop, back pack, purse, climbing gear, briefcase, or anything else that is within your reach. Writes in extreme temperatures from -30F to 250F. Writes at any angle, even in Zero Gravity. Each Fisher Space Pen is precision assembled and hand tested in the USA. Each carries an unconditional lifetime guarantee