 Other materials used include resistance wire, carbon particles in plastic, and a ceramic/metal mixture called cermet.Conductive track potentiometers use conductive polymer resistor pastes that contain hard-wearing resins and polymers, solvents, and lubricant, in addition to the carbon that provides the conductive properties.Multiturn potentiometers are also operated by rotating a shaft, but by several turns rather than less than a full turn.