This is Patrick's flugelhorn mouthpiece. I bought it new six months ago. The size is 84, the same size as the Patrick Commercial Series 84. If you have mouthpieces from the same company, switching between them should be very easy. It gives a full sound and a straightforward feel when playing. Inner diameter: 16.256mm (equivalent to Bach 3~5) Shank: Large taper (Yamaha shank) Patrick mouthpieces are only available for trumpets at domestic distributors, and when buying new, you'll incur shipping costs for personal import, and it takes time for delivery. It is also listed on other sites, so it may be removed. Please take this opportunity to try it out.