They're quite pricey, CornBall...
was debating between this one http://www.amazon.co.uk/Fisher-Space-Pen-Rainbow-Lacquer/dp/B000HLD7ZC/ref=sr_1_2?s=officeproduct&ie=UTF8&qid=1425045701&sr=1-2&keywords=space+pen+titanium
and this one http://www.amazon.co.uk/Fisher-Famous-Titanium-Nitride-Lacquer/dp/B000HLD81U/ref=sr_1_1?s=officeproduct&ie=UTF8&qid=1425045701&sr=1-1&keywords=space+pen+titanium
I have a brushed silver one you can have for nothing, Joe. I never use it.
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They're quite pricey, CornBall...