What Are Pianos Made Of?
The keys, of course, are made of plastic. But the piano cabinets are made of thousands of pieces of wood that are strongly secured together. (Approximately 70% of a piano is wood!) The hammers and other parts of the playing implements are made of wood, paper, iron, copper, steel, felt and some other makings. All together, a piano is made up of approximately 12,000 parts in a piano, 10,000 of those parts move to produce sounds. - Piano Sheet Music Online
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