The GP-310 is the Perfect Combination of Innovation and Tradition. From the moment your hands touch the keys, the GP-310 Grand Hybrid delivers the authenticity your performance demands. The revolutionary Natural Grand Hammer Action keyboard is made with full-length wooden concert grand piano keys, using the same materials and processes as the C. Bechstein concert grand pianos. A keypress sends a hammer along the same vertical path as a grand piano, with the same essential weighting and pivot points, resulting in a true and uncompromising piano touch.