B-flat, A, D, alto clarinets & basset horn phonic ring

Who would have thought that such a small accessory could make such a difference to the sound? This copper ring fits between the mouthpiece and the barrel, the barrel and the upper joint, the upper and lower joints, and between the lower joint and the bell of the clarinet to create an acoustic connection. The material adds roundness and depth to the sound. You won't want to be without it!