The Sonos Tube are made from carefully selected, specially treated aluminum tubes that are precisely tuned to C 512 Hz (the third of A 432 Hz)

The mountable brush is not only suitable for cajons / framedrums, but can also be placed on the edge of the playing surface of almost any instrument. The fine, round nylon rods provide a very warm punch. The Velcro fastening means you have your hands free when you need them. The brush can be removed.