RS Berkeley Freedom Adjustable Clarinet Barrel Freedom Adjustable Clarinet Barrel is ideal for both large and medium bore clarinets Made from aluminum alloy, the Freedom barrel has an infinite adjustable range below 60mm - above 70mm The mechanics of the Freedom barrel allows the mouthpiece to remain stationary during adjustment, allowing fine tuning corrections while playing This American made barrel will give you the freedom to tune in any situation. Freedom Clarinet Barrel by RS Berkeley Instruments is a great choice for any clarinet player!