High-quality trombone mouthpiece, JK EXCLUSIVE model. - Brand: JK (Josef Klier) - Model: EXCLUSIVE, 8B SB (Back Shank) - Included: Box, cleaning brush I purchased this for an alto trombone but haven't had the opportunity to use it, so I'm selling it. I am also listing this on other flea market sites, so I may remove the listing. Thank you for looking.