The Wartenberg Pinwheel is a twenty-two-point stainless steel wheel that turn freely attached to a sturdy handle.
Here is a short excerpt from Willow Wand’s Pinwheel review:
“Pointy, spikey, ouch, LOVE IT! If used lightly it can tickle and you can still put pressure on it to make it a bit more painful. I have been told that those into bloodplay (which is still not something I have been able to handle yet, but am curious about) like to use it pretty darn hard, and poke through the skin.”