A pinwheel, also called a Wartenberg pinwheel or Wartenberg neurowheel, is a medical device for neurological use that is also used as a punishment and sensation play tool in BDSM play.

It was originally designed by Robert Wartenberg to test nerve reactions (sensitivity) as it rolled systematically across the skin. A pinwheel is generally made of stainless steel with a handle of approximately seven inches in length. The wheel, which has evenly-spaced radiating sharp pins, rotates as it is rolled across the flesh.

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