[seltzered]

I looked into this a bit, and if I'm guessing correctly, the alloy isn't different than the alloy 'ethergraf' tips that have been in the market since 2010, and saw them as cheap as ~25 bucks. These are the sites I bookmarked when looking into it:

http://www.axelweinbrecht.de/en/Produkte/Schreiben_mit_Metal...

http://www.napkin4ever.com/it/

http://www.vat19.com/item/the-inkless-metal-pen

Basically it's not 'everlasting', but lasts for maybe a few years, and you may have to sand the tip down occasionally to make it a finer point again. Note that it does use a bit of lead, and so isn't recommended for use by children. I don't plan on buying any one myself, since it just doesn't seem like the writing give fine-enough of a point for my needs (search on youtube, there's a review or two of these things.)