Design of the Strings Enriches the Sound
A piano keyboard has 88 keys. The number of strings depends on the model, but is usually around 230. For the tenor and treble notes, three strings are strung for each key, and for bass notes, the number of strings per note decreases from three, to two, and then to one as you approach the lowest bass notes.
In addition, the strings become shorter in length going from low-pitched notes to high. The thickness of the string changes in steps, and the higher the pitch of the note, the thinner the string. Strings for bass notes are wound with copper wire, while strings for tenor and treble notes use bare wire and are not wound.