The bodies were a lightweight construction made from large extruded profiles of an aluminium-silicon alloy, the base plan was built as a hollow chamber profile.

Measuring between 100cm and 120cm, it's 200 years old and has seven strings and two hollow chambers.

A diagram showed an elastomer-type ring with multiple hollow chambers surrounding the center line of the wheel circumference.

While most basses have solid bodies, they can also include hollow chambers to increase the resonance or reduce the weight of the instrument.

Both types of suppressors reduce noise by allowing the rapidly expanding gases from the firing of the cartridge to be decelerated and cooled through a series of hollow chambers.