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.
All grands are equipped with three pedals of solid brass. They serve for shifting the keyboard, sostenuto and sustaining. The casters for all Models have swivel stems and solid brass wheels 3 cm to 7 cm wide according to sized of the instrument. The concert grand casters have a swivel stem and special double wheels on brass bearings, with a locking mechanism included. All external hardware is of solid brass.