Cut threads create hundreds of teeth that grip the pinblock and keep the piano in tune longer. Strings Bass strings wound with solid copper, and Roslau treble string wire of the highest grade steel provide superior tone. Plate and Finishes Cast from gray iron to the most precise tolerances. Cabinet parts finished in a wide variety of natural wood veneers with durable polyester or polyurethane top coats. Rosette-shaped, extruded aluminum action rails and flanges mean increased stability and less frequent regulation.
Piano keys are spruce, and are individually balanced and weighted.
All wood used for making parts is naturally cured and kiln dried to the precise moisture content specified, to assure precision and long life. Grand piano rims and upright case components are laminated Philippine mahogany, for stability, strength and long life. Computer-designed radiating grand braces of laminated Philippine mahogany provide stronger, triangular support compared to parallel designs. Uprights similarly employ staggered backposts. This rigid support increases tuning stability, soundboard crown retention and long piano life.