The World's Slimmest* Digital Piano, Perfect for Any Room. The keyboard mechanism, speakers and other components have been miniaturized as far as possible while still delivering the highest performance. Crucial to the keyboard's small size is Casio's proprietary high-density technology, featuring a space-saving internal structure with the circuit board mounted vertically. These innovations and others have made possible the world's slimmest* digital piano in terms of depth – allowing for extremely flexible placement.