Versatility Defined The Fatboy is at home in the world's most prestigious concert halls, famous jazz clubs, and everything in between. It's our best-selling barrel, and for good reason. Artists who are called upon to interpret a wide variety of music appreciate the Fatboy Barrel’s unique flexibility and versatility. Note: In Japan, this model is known as the Backun Barrel. Specs: Grenadilla or cocobolo wood. Compatible with Bb and A clarinets. Includes One barrel, one velvet bag, and one barrel tube. Fit and Sizing FIT BRANDS Standard Backun, Buffet, Yamaha, Leblanc, Selmer USA (Centered Tone, 10G, Series 9), and most other brands Selmer Paris Selmer Paris (Not including: Selmer USA, 10G, Centred Tone, Series 9)