Spiky ring
thingiverse
This is a spiky ring that when you turn it facing away from your palm you can fend off pester some cardboard boxes turn it inward and then you have the ultimate high-five betrayal (careful with the last one it may ruin friendships).The ring size is 9 (19mm).I would advise you to not use it to hurt others because it may break and play a Uno reverse and hurt you back.
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