The Original Astronaut Space Pen is retractable with side button release. Length is 5.09" diameter is .375" all metal composition. This pen has thixotropic ink in a hermetically sealed, pressurized reservoir writes three times longer than an ordinary ballpoint. It has a stainless steel precision socket that prevents leaking yet delivers uniform ink flow. This pen has a ultra-hard tungsten carbide ball and sliding float that separates ink from pressurized gas.
