This Cone design is a result of many years of refining the process of hand-spinning cones The Legend Cone TM is Triple Spun from a specific aluminum alloy. The shape has been modified from a traditional style cone to produce a clear bell-like tone and lower resonant frequency. The Triple Spun process and highly polished finish improve response and sustain. Like all Beard cones, I personally spin each one by hand to exacting standards. The Legend Cone will improve the Volume and tone of any resonator guitar. Includes tension screw. Measures 10-9/16″ in diameter.