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Black Titanium Nitride Astronaut PenThis is a New Fisher Space Pen, Model #AG7-BTN Black Titanium Nitride Astronaut Pen. "The Pen That Went to the Moon" It features a Black Titanium Nitride finish, a pocket clip and a tapered barrel. It comes with black ink and a medium point and is a retractable pen with a side button release. This pen is 5" long, and the tapered barrel goes from .375 at the cap to .240 at the tip. It comes with a gift box and sleeve. The Astronaut uses the standard "SPR" series refills. This pen comes with a Fisher Space Pen SPR Series Pressurized Black Ink/ Medium Point ink Cartridge installed. The Fisher SPR series refill was developed for NASA and has been used on EVERY Space Shuttle mission both American and Russian. They are hermetically sealed with a specially formulated thixotropic ink and pressurized to about 35 PSI. They are the only refills that will write at any angle because they do not rely on gravity, and have a shelf life of 100 years. The bottom paragraph tells more about the Fisher story. The Astronaut is an all metal pen. This is a super nice pen. TO ADD OPTIONAL $3.50 INK COLOR AND POINTCHANGE OUT SERVICE TO YOUR ORDER: ►INK COLOR AND POINT PREFERENCE: We get a lot of requests to change out the ink cartridge to suit the buyer's personal preference for color. We will change out the black ink / medium point cartridge that are standard in most pens to a color and point refill cartridge of your choice for $3.50 per pen. From our eBay store home page - just click on the TOP CATEGORY “CUSTOMIZING YOUR PEN” and select the listing Fisher Space Pen. Please purchase the Ink Preference and the pen and combine the payment. The Fisher refills fit the Retro 51 pens with the Parker adapters but the Retro 51 refills do not fit the Fisher pens so we have separate listing for the choices of the two pens. Type or paste the Listing number below into the search bar then add it to the shopping cart with the pen you are purchasing and pay at the same time.Fisher Space Pen Ink Change Out ServiceFor $3.50 additional Charge Listing Number 293004811034Your choices are:Fisher SPR Pressurized Ballpoints:Black / Fine, Black / Medium, Black / BoldBlue / Fine, Blue / Medium, Blue / BoldRed / Medium, Red / FineGreen / Medium, Green / FinePurple / Medium - Silver / MediumBrown / Medium - Burgundy / MediumOR .... Turquoise / Medium About Fisher Space Pen:Fisher Space Pen is yet another great breakthrough from space research. No other pen has so much to offer. This pen was designed in 1965 by Paul C. Fisher, for NASA, and with no cost to NASA or our government. Ordinary pens rely on gravity to write. Hold them upside down and they quit. There was a need for a pen that would work in the zero gravity vacuum of space, and in extreme conditions. Paul Fisher developed such a pen. For the ink cartridge to write at any angle the cartridge was charged with 35 PSI of nitrogen. A small ball type float was used to separate the gas charge from the ink and it had to be hermetically sealed to hold the charge. With that type of pressure a precision fit stainless steel machined socket with a tungsten carbide ball and a specially formulated thixotropic ink was used keep the pen sealed and leak free. Fisher Space Pens have been used on EVERY Space Shuttle mission, both USA and Russian. They were also featured on a Seinfeld episode. ..... Imitated but never duplicated..... Because it is hermetically sealed it will not dry out like other pens and has a shelf life of over a hundred years. It does not rely on Gravity, It writes upside down, in the vacuum of space, on wet paper, underwater, in the freezing cold of -30° F, and the boiling heat of 250° F. Fisher Ink cartridges stay leak free and writing longer, cleaner, and more consistently than any other ink cartridges. Fishers are not only utilized by Astronauts but the Thunderbirds, the Blue Angels, the Navy Seals, and the Canadian Snowbirds also use the Fisher pen. Fishers are favorites among Firefighters, Paramedics, and Police Officers. We have even sold them to Tow Truck operators is Alaska that needed a pen to write in subzero conditions. If you count on a pen to work, you need a pen with a Fisher ink cartridge. The Fisher Bullet Pen was exhibited at the New York Museum of Modern Art. It has been featured on the Tonight Show, Good morning America, John Ratzenberger's Made in America, and an episode of Seinfeld. Still proudly made here in the USA and I can tell you first hand Fisher Space Pen Company is made up of great people. Fisher has a wide variety of pens to fit almost anyone’s wants and needs in a variety of price ranges. Pens from the economy line that are gas pressurized, Plastic barrels, and not refillable at about $5.00 to the Infinium Series Pens that is warranted to never run out of Ink for a lifetime at about $150.00. Of course, there are many series in between so you are sure to find the pen that fits your needs and style. All of this brings me ask the question, “Sure you could buy another pen, but why would you?” Fisher refills come with an adapter to fit them to Parker and Parker Style ballpoint pens. Fisher also makes pressurized refills to fit Cross style pens. See the Fisher line by visiting our eBay store. Just clicking on the store link, then select the category you would like to see from the list on the right hand side of the page. Thank You From Cyber Pen Sales