A single-wheel pinwheel with a molded plastic handle for added grip.
The Black Handle Wartenberg Pinwheel is a medical instrument commonly used in neurological exams and BDSM play.
It consists of a black plastic handle and a metal wheel with multiple spikes that rotate when the handle is turned.
The spikes create a prickling sensation on the skin, which can be used to test nerve function or as a form of sensory play.