The concept has also been adapted to produce an experimental musical instrument created by Bart Hopkin. This application of Savart's wheel consists of a series of 30 wooden disks of increasing size mounted on a motorized axle. Rasping vibrations are induced in a plectrum when it comes into contact with the ridges that line each disk at regular intervals, and are amplified in a styrofoam cup which acts as a sounding board. The instrument is claimed to make "the most obtrusive, obnoxious and irritating sound ever known."