Our standard rental handpan is a basic model that has slight imperfections, and the tonal quality is not as refined as our pro. It is a great introductory model to give you a rudimentary sense of the handpan itself. The pro rental is more upscale--a nicer finish that has more precise tuning, much closer to the Dii handpans we sell. Many people rent these for events and performances. Both are usually an 8-note D minor scale, but we do have a couple other scales as well.