Wartenberg Pinwheel

Wartenberg Pinwheels, Wartenberg Neurowheel, Wartenberg wheel where created as medical instruments designed to test neurological sensation function. However, their medical usage has fallen out of fashion due to hygiene concerns.

They are made out of stainless steel and have evenly spaced radiating pins.
There usage today is primarily seen as a sensation sex toy and in the BDSM community.