Drawing on over a hundred years of experience and craftsmanship in making world class acoustic pianos, Yamaha introduces the Arius series. All of these instruments provide exceptionally natural, grand piano-like touch, with realistic weight gradations-heavy in the lower end, and light in the upper. The YDP–140 features the entry-level Graded Hammer Standard (GHS) keyboard with realistic matte black finish key tops. While technically an entry level action (beneath the more sophisticated Graded Hammer Effect), GHS is designed for budding pianists who require weighted keys to develop the proper playing technique for an acoustic grand.