Set of 3 440 Drone Extensions. Add these small extensions to the top of your drones and this will allow you to tune them easily to concert pitch without the need for special reeds. Stepped to fit a variety of drone bush. Depending upon your set up you may have to open the drone reed bridles a fraction to compensate for the change in drone operating pressure but once set you can quickly change from concert pitch to todays pitch with the minimum of fuss.
