Cirkulær soft potentiometer (Softpot) - Rund, Ø56mmManufactured by Spectra Symbol, these are nice little ribbon controllers (also known as 'soft potentiometers') with an adhesive backing. This shape is a circular soft potentiometer with a donut shaped sensing region whose outer diameter is 56mm and inner diameter is 36mm. There is a nominal 10K resistance across the two outer leads. The middle pin resistance with respect to either of the outer pins changes depending on where on the strip one presses.