Every photographer likely has their favorite props and model outfits to work with for various reasons.
This is ours.
They're not 'store-bought'. Nor are they replicas.
This pair of cuffs were actually once used in a psychiatric hospital to confine mentally disturbed and violent inmates. Unlike their store-bought counterparts, these have an actual history of genuine practical use.
They're rather funky in design. The straps are double-reinforced with braided steel cable inside and the ratchet locking mechanism is heavy-duty and nearly impossible to open with only one hand.
For bondage/fetish practitioners and photographers, they're about as close to the holy grail of confinement props as you can imagine.