What are the black piano keys made from?
Classically, they were made of ebony wood, but ebony is much too scarce and expensive to be used now, so today they are made of a very hard wood (typically maple or rosewood) polished very smooth, and coated with a plastic resin or black lacquer.,
The piano keyboard is made of black and white keys. The black keys are in groups of two and three. The note "A" is the white key between the rightmost two black keys in the group of three black keys. There are eight different "A" keys on a standard 88 note piano. The lowest key on a standard piano is also the note A.