Features Silver-Plated Brass Body is made from the highest quality brass and finished with a bright silver-plate ensuring fine playability and tonal brilliance Stainless Steel Pistons have remarkably smooth, fast action for improved agility and playability A Removable Valve Section perfect for allowing full access to areas that would be normally unreachable to a repair technician Key of BBb Silver-Plated Finish Description Product Description The 594S BBb Sousaphone features a .687" bore, silver plated body and 26" bell, removable front action valve section, all brass construction, and nickel silver pistons. Includes deluxe molded case with wheels.