This is a set of five recorder quartet sheet music books published by Tokyo Ongaku Shoin. One book has writing on the back cover, but the others have no noticeable scratches or writing. They are in good condition for sheet music from about 30 years ago. The list price was 1030 yen per book. The instrumentation is two sopranos, one alto, and one tenor. They can be used not only for recorder ensemble but also for Venova ensemble (as they are SATB). They are out of print, so I think they are valuable. Thank you.