Me any my girlfriend love this thing. Struggle, squirm, and pull with all your might, but you wont get out. It is great for travel, great for beginners, and can stand up to the punishment of more advanced/wild users like me. It also works great with other items like leather cuffs and it can accommodate multiple positions

This product comes with a 4 point, adjustable tether system that's all attached together, and 4 individual cuffs that are all the same size. The ends of the tether points look like the ring on a key chain, and while they aren't any bigger than a standard key chain ring, they seem way more durable. I would still advise you to not attach anything by going through the rings, as this can bend the metal and wear it out, but attaching a connecter around it will make the rings last ten times longer. The cuffs are surprisingly soft, but are very durable. Velcro straps are used to close the cuffs and, unless you intentionally pull them, they won't fall off or get pulled off. The Velcro straps can be a bit scratchy (I wish that they had lined it with something soft) but usually it doesn't get in the way.

The tether system is very easy to setup on a single or queen sized bed, and they even have a video on their website and Youtube if you're still confused. The adjusters for the tethers are similar to what you would see on a standard backpack, but they can take a good amount of pulling and tugging, so for not having an adjustment locking system it was very impressive. You can even use this set with any other cuffs and use the cuffs that come with the kit as a connector if you don't have any. With a few locks it can even become inescapable.