This string picks up the vibrations sympathetically and enhances the overtone spectrum of the instrument. The treble strings and the core wire are of highest grade, strong, elastic steel wire. The high precision in production avoids differences in diameters, which ensures a clear tone without any falseness. The wrappings of the bass strings are of solid copper, the core of hexagonal diameter. All parts are made of select sound hardwood, free from imperfections.
Center pins are of nickel silver.
All hammers are wired through and through. All keys are made of spruce, The sharps are made of ebony and the white keys are covered with acrylic. The balance-rail bushings are fitted with leather, the front bushings with bushing cloth. For the keybed, select spruce is glued together in several layers to a total thickness of 42 mm to 45 mm, depending on the size of the instrument. Red beech is inserted where the attachments of the legs are situated.