This is a direct-blow cap for a YAMAHA wooden bass recorder. Currently, there is no information available online, so it's possible that it has been discontinued. I received this as an option for the YRB-61, but I often use a crook, so this cap has been in storage. Therefore, I've decided to sell it. * Made by Yamaha for the YRB-61 (maple wood). * Judging by the color, it was likely manufactured for current models or those from a little while ago. * Due to individual differences, cork adjustments may be necessary. Please make the adjustments yourself if needed. Some people remove the crook cap and play directly, but using this cap allows you to direct the sound towards the window, which is convenient for sound projection. What do you think? Feel free to ask any questions or make offers for a price reduction.