Fisher Space Pen Tactical Trekker Space Pen with Break-Away, Caranbeer and Key Ring, Gift Boxed (T725B) 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 a lifetime guarantee against all manufacturing defects All Brass and steel construction gift boxed