The Breath Builder Isomeric Exerciser helps you increase breath control for better performance in music. Instrumentalists and vocalists alike find they can use their breath energy more efficiently. Improve your tone, and most of all, those long phrases will trouble you no more! Feel gratification and have more confidence singing and playing. Includes 2 straw tube sizes: Small for resistance, used for upper brass and all woodwinds except the flute; Large for vocal, low brass, and the flute.