This a a simple and easy to make piano made of knex
In the parts list there is also 21 washers 22 black clips and 9-10ft of sting for decoration.
Step 2: Keys and Note Strings
Step 6: String Notes (optional)
The strings get wrapped around the black clips starting with the one on the right of the piano working to the other end of the piano. then tie loosly to the purple and blue connector in the back of the piano.