Fancy playing Naughty Policeman?
These light, metal handcuffs are intended more for play than for serious domination, the quick release mechanism is useful in case you lose the two keys provided, but a determined detainee would probably be able to activate it, so don't rely on these to be able to restrain anybody who is actually trying to escape!
However they do look sexy as hell, and the sensation of metal on your wrists can be very erotic, so why not get a pair anyway for those flirty moments alone together?