Over 30 years old. For those planning to go to space, how about it? (^^) Bullet type Total length → 10.3cm 9,900 Japanese Yen No case The Fisher Space Pen is used by all astronauts after rigorous testing by NASA (National Aeronautics and Space Administration). Regular ballpoint pens rely on gravity to move the ink to the tip of the ball, but the Space Pen uses the pressure of nitrogen gas sealed inside to move the ink to the tip of the ballpoint pen. Therefore, it can start writing immediately even upside down, and can write smoothly in zero gravity, underwater, and extreme temperatures (-34 to +121°C). In addition, the special, highly adhesive ink is sealed, so it does not dry out and can be stored for over 100 years. This heavy-duty performance that doesn't depend on conditions, and the all-around ability to write on glossy surfaces such as photos and oily surfaces. That's the feature of the Space Pen.