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.