You are going to say either "yikes!" or "so what?" - but, I'd like to explain why this particular combination is so special.
Piezoceramic multilayer actuators (PICMA®) consist of several layers of piezoceramic material that are just a few micrometers thick. Basic information under >> Fundamentals of Piezo Technology: Principally, the displacement of the piezo actuator is proportional to the electric field applied, which determines the direction of the inner structure of the piezo material as a result. In turn, the electric field is calculated from the quotient of the applied voltage divided by the thickness of the actuator layer – or put more simply, the thinner the layer, the less voltage is required for achieving displacement of the actuator.