These metal cuffs are lined with cushy faux fur (no animal died for these bondage instruments) and are quite comfortable, from what the bitch I put them on tells me. They also adjusted quite easily to fit her little slut wrists. Two keys come thoughtfully packaged with the cuffs, and they open the locks quite quickly when placed in the slots, but, well, the bitch is staying in the cuffs for a while. She just looks good in them, and, well, I need a foot stool.