These are piano teaching and learning tools designed for visual learners to easily be able to recognize the patterns and learn the basics of music and piano with ease. Each tool sits behind the black keys on the piano and can slide left and right. When the left most notch is aligned with a specific note, the rest of the notches will fall in line and show the pianist the rest of the notes in the desired chord or scale! Each of these are printed and shipped to order. If you have any special request, reach out and I will do anything I can to make it happen!