These barrels are made from BEHN rod rubber for optimum dimensional stability and impeccable resonance. They are available with our patent-pending +HAPTIC Feedback built into the center ring's motion. Every 1/4 turn, you'll feel a slight point of resistance and release, giving you blind access to the exact position of your barrel's length.
 
The center tuning ring is made of stainless steal offering significant sturdiness, tonal impact, and resonant power. The barrels have a 5 mm range of motion totally from 63 to 68 mm.