This is a set of two books, LEVEL 10 and 11, from Kawai Publishing, designed for learning improvisation. They haven't been used, so there are no markings or folds, and the inside is in good condition. However, the spines are faded due to long-term storage. I hope to sell these to someone who wants to practice a lot of exercises, such as those preparing for piano grade exams or aspiring kindergarten teachers. Please consider purchasing if you understand that these are items stored at home for a long time.