Shinobue Flute, Key of 9, 7 holes Inner diameter: 18mm Selling as I haven't used it much, just tested it. Will sterilize before shipping. Please refrain from purchasing if you are overly concerned about details. Thank you. Please refrain from purchasing if you are overly concerned about details. Thank you. Shipping included, excluding Okinawa, Hokkaido, and remote islands. *Important* I am often bothered by people who make excessive price negotiations. I will delete comments or block users. I will also block users who are unresponsive to comments. Thank you for a smooth transaction. I generally do not accommodate requests for holds or reservations. Only those who can complete the transaction immediately, please.