Hailun Grand Piano HG161 Professional, the 5ft4 Hailun HG161 Grand Piano has a rich tone. The unprecedented power for its size will provide many plesant experiences for students and performers of all levels. Hammer Felt: Reinforced German Felt. Roslau Duplex Scaling String. Soundboard: All mountain spruce 15 degree spruce meniscus coating for climatic resistance and flexinility.