I'm pretty sure they are for petplay. They are gloves that look like paws and, in this case, can probably be locked. When you wear them, they restrain your hands a bit, i.e. you can't grab anything or take off the gloves by yourself. If you want to look them up online, search terms like "petplay paws" and "petplay restraints" (or terms like "pup play" and "pony play" if you want to be more specific). There are lots of different ways to do petplay, though, so you might not find them right away.