Since it`s design in the 1950`s the Fisher Space Pen has fulfilled many roles. Not only has it performed in outer space but is a valuable tool for the emergency services. The Police Pro Zero Gravity Pen is 5 1/4 inches long closed and has a rubberized triangular body stamped "Police Pro". The secret behind the Fisher Space Pen lies in the unique design characteristics of the ink and the high precision manufacturing tolerances of the ball point and socket. The ink is fed to the ball point by gas pressure permitting the pen to write in any position.