Piezo switches are available in standard mounting diameters of 16, 19, 22, 24, 27 and 30mm. Other mounting diameters, materials, colors and shapes can be custom designed. Laser lettering is available on the actuating surface. A variety of standard legends exist. Customer-specific lettering and symbols can also be produced. Versions with point or ring illumination, for display of switch position ON/OFF or other optical feedback are available.