This self-defense tool by Tooto slips over two fingers, creating a small knuckle duster. It’s made of a titanium alloy and weighs under an ounce.
I’m not sure if it’s effective. The spikes are curved inward, rather than toward a target. But Batman is more than just a man in a batsuit--he’s Batman even without it. If you can use a tool shaped like the Batman logo effectively, then you get to be Batman.
-via Dude I Want That
I don't know about other states, but if you are caught with these in California, you will be charged with a felony and you will be booked.
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