Pioneering in technology the trekker Space Pen can hang upside down forever yet function immediately when needed. This pen is the Bomb for so many different folks. Are you an executive? Put it on your keychain and always have a quality writing instrument at hand. Police/Fire/Ambulance...clip it to your belt and it will sail through the daily abuse it will get! Students love this on their school lanyard. It"s the choice of mountain climbers, sojourners, farmers, and security guards. Give this pen as a gift and you"ll be remembered forever. * Writes at any angle, even in Zero Gravity. Simply the most versatile pen ever made. * Writes in extreme temperatures from -30F to 250F * Each Fisher Space Pen is precision assembled, hand tested, and carries an unconditional lifetime guarantee. * All Brass and steel construction