In 1967, after over two years of rigorous testing by NASA, the Fisher Space Pen was officially selected for use by the Astronauts of Apollo 7 and has been used on all manned space flights since. The Shuttle Space Pen is the latest installment to our Astronaut pen line and was introduced during the Space Shuttle Program as a light-weight alternative to the original AG7 ‘Anti-Gravity Pen’, which was first patented by Paul C. Fisher in 1965. The CH4 Shuttle Pen is now considered to be the pen of choice of the astronauts on the ISS today. Each CH4 is composed of solid brass with a shiny chrome finish, and all are proudly produced in the USA! The CH4 has a modernized appearance and is both thinner & lighter than its predecessor the AG7. It features a unique dual-action knock mechanism that extends the tip via the knock on the end, with a release button on the side to retract it. This side retract button has a satisfying sound and feel to it, ensuring that you will always remember to retract the point before putting the pen away in a bag or pocket. Shuttle Pens are packaged in a heavy-duty gift box with flock lining and each includes a guarantee and re-order pamphlet with a brief description of the history of Fisher Space Pen Co.