The leather from a cow's or a deer's hide is used to make the 88 backchecks in the action.  These little parts catch the hammers when they come back from striking the key and stops them, holding them ready for the next time. 

 

The plate of the piano is made from cast iron, which is strong enough to hold the piano's shape and keep the strings tight, even with the 20 tons or more of pressure on it.  The plate is the heaviest part of the piano, weighing between 300 to 600 pounds.

 

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