The sousaphone is a valved brass instrument with the same tube length and musical range as other tubas.The bell is normally detachable from the instrument body to facilitate transportation and storage.
It is manufactured from sheet brass, usually yellow or silver, with silver, lacquer, and gold plating options, much like many brass instruments.It is in the key of Bb, and the instrument's part is usually read in "concert pitch",
Dimensions : Length: 42 " Diameter---25"
The 25 inches length includes the fold of the brass sheets of the bell at the front.
In India we call it Surajmukhi Musical Instruments , which means this instrument face resembles to that of sun .