The K131 has bass strings and soundboard area larger than a small grand piano. This combined with longer keys and top of the range hammers combine to produce massive bass power, crystal clear treble, and a truly sensational palette of sound, as well as an extremely resonsive touch. It is for those who demand the the very best that an upright can offer and who wish to extract every subtle nuance from their music. Practice pedal comes as standard; solid double brass castors.