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it's just like the wristband or headband, but smaller. Pure genius. They seem well constructed enough. Oakley fingerbands are a great toy for me. I wear them for no reason. Might wear them while typing or coding. They add a nice squeeze, and actually keep my fingers warm. You might try wearing them on the middle section of finger rather than pushed all the way up. 
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Color: Black/White
No real purpose but really cool to have for the collection next to the Icon Wristbands.
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Meh, pretty useless in my eyes.  Theyre thick as hell too, so I guess they'll do the job theyre intended to if need-be.
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Its kind of cool.  If you put 2 or 3 on one hand they are pretty nice if you are playing basketball or jogging. That way you can wipe the sweat of your brow.  Wristbands are a bit more useful but these look cool.  
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A cool display item but no real use for it. Maybe for poker games?