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Not this sort of pen!
[img] http://pagead2.googlesyndication.com/simgad/13431291906585441725 [/img]
Contextual advertising fail!
Tsskkkk, pen ponces. 😀
Pah! This was on the market years ago: http://www.coldsteel-uk.com/store/Pocket-Shark-Sharkie.html
Much more subtle, should you be asked to turn your pockets out.
Even a regular Sharpie would be effective against strike points, as a yukawara stick.
There's loads of those 'tactical pens' on the market, some more 'tactical' than others, but a Bic Crystal used the right way would be as effective.
My pen is massive
The Stainless Steel Sharpie works too...
http://www.survivaldepot.co.uk/product/sharpie_stainless_steel