The Wartenberg pinwheel is a fun little toy for sensation play. The wheel itself has about two dozen spiky "pins" that manage to feel quite prickly without being sharp enough to easily puncture skin.
The spiked wheel rotates quite freely on it's axis. So, the tips can be dragged extremely lightly and quickly over the skin to create a slightly tickly sensation. Or, they can be dragged hard and slow (or hard and fast) for a more intense sensation, which some people say feels like being cut with a sharp blade. I don't really agree that it feels quite that intense, but I've never done any intentional cutting, so I might not be the best authority on the subject.
It is possible that you could break the skin with this toy, but you would have to press extremely hard to do so. The Wartenberg wheel was originally designed by a doctor (Dr. Wartenberg, if you can believe it.) to test nerve response, so it is meant to create intense sensations without causing damage to the skin.
I find that if I press hard as I roll it, the wheel leaves a line of tiny red dots on my skin that last for a few hours. But, it feels like I would have to put quite a bit more muscle behind it if I wanted to see blood.
And, speaking of bodily fluids, the wheel appears to made from stainless steel, so it should be easy to sanitize between users if necessary. Bleach or boiling water should do the trick, or soap and water if you just need to do some everyday cleaning. Obviously, make sure to dry it off, so it does not rust.
Honestly, the only thing that I really dislike about this toy is the little plastic pouch it comes in. The pouch really isn't sturdy enough to hold up to use as long-term storage for the sharp and pointy pinwheel. And, you really are going to want some sort of decent cover for this toy, since you don't want it floating around unprotected in your toy box waiting to poke your fingers or scratch your other toys.
Otherwise this is a nice toy, appropriate for anyone who wants to experiment with new sensations.
This toy was provided to me free of charge by Eden Fantasys in exchange for an honest product review.