If I remember my 6th form Human Bio correctly (it was called "6th form" before they decided to call it "Year 12") O Neg blood can be given to anyone but any other blood has to match or it will clott pretty much instantly so I wouldn't expect any emergency Doctor giving blood without checking it is the right stuff.
No idea on what they would cost to produce, but if they were priced in the order of $10 each I'd be interested in a vinyl type sticky with the KB logo and my user name, perhaps one each for the bike and my helmet.
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