Fisher Space Pen Raw Brass Bullet Pen (400-RAW) 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 and hand tested in the USA. Each carries an unconditional lifetime guarantee. This pen casing is RAW UNFINISHED BRASS. Over time each pen will develop a unique patina as it responds to the environment, owner's body chemistry, and the way he or she handles their pen. Open the Bullet measures 5.3 inches with a closed length of 3.7 inches and a diameter .3 inches