Lowest price:$69.00Description: Tuning is accomplished through a modification of the internal barrel length (from 61mm to 67mm). Push the thumb wheel up or down and the inside length of the barrel will increase or decrease. A distinct audible and tactile click will be noticed at every millimeter. The Locking Model introduces a bottom ring that locks the barrel into position during mouthpiece changes or assembly. It also features the darkest sound available. Especially suited for classical playing.