How come 400 of the space pens cost less than 20 dollars but the "AG7" model sells for 50 dollars each?

Mark,I believe "400" is the model number for the pen with gift box, not the quantity. The price is for one pen.Hope this will help.RegardsWilson

What kind of ink can I buy to refill the 400 Fisher Space Pen?

Fisher Space Pen Universal Refills. So far I've found ink in black, blue, red & purple. I found them on Amazon. :)

When I write with this pen or shake it slightly, you can hear a rattle, as if the cartridge is hitting the side of the case. Anyone else have this?

I do not hear a rattle. Not even if I shake it. Try unscrewing the cartridge and then putting back together.

How long will the ink last in direct sunlight? I've got a map on my truck and want to trace my route. Sharpe "permanent" pens were not permanent.

As for direct sun light I cannot say being an underground coal miner... it works great after exposure to those circumstances but with the way the ink cartridge is made I believe it would be great. Have you thought of leaving maps behind and using a gps on a smartphone? They can be set to save your routes and you can trace them out on a map later... This is also not a felt pen so it won't dry out

Manufacturer	Fisher Space Pen
Brand	Fisher Space Pen
Model number	400BRC
Product Dimensions	9.53 x 0.81 x 0.81 cm; 28.35 g
Color	Chrome
Closure	Twist
Grade	0.32
Grip Type	Knurled
Material Type	Aluminum,Chrome,Brass
Number of Items	1
Size	1 Count (Pack of 1)
Point Type	Medium
Line Size	0.5mm
Ink Color	Black
Tip Type	Tungsten Carbide Ball
Manufacturer Part Number	400BRC
Item Weight	28.4 g

Brushed Chrome

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