This is U-KEYS® official educational aid which helps novice music learners start their musical journeys. Our educational U-KEYS® is also the perfect companion for piano teachers or music theory teachers. This product helps attract young musicians to the instrument. This standard educational tool comes with 15 piano key overlays. Our educational series is a “one size fits” all overlay. These overlays are not made to match every piano or keyboard perfectly. However, they do not hinder the functionality of the instrument. The educational series does not cover the entire instrument as our premium custom series does.