The GP-500BP is a uniquely constructed three-sensor, high-end digital piano in the Celviano family, housing grand piano hammer action and superlatively fluid and sensitive touch. The top board can be opened and closed for a glimpse of the hammers to feel Casio's own distinctive action. Casio's Air Grand produces naturally pleasing performances thanks to extensive research and analysis of tonal quality and the distinctiveness of the greatest pianos in history, including the Berlin Grand developed jointly with Bechstein. A hybrid design concept that fuses acoustic tradition with technology.