The Jupiter 596S Fiberglass Series BBb Sousaphone is one of the more sturdy marching instruments currently on the market. The 596S sousaphone features a durable white fiberglass body with a 26-inch bell for great projection plus an easily removable valve and slide body for easy maintenance. The Jupiter 596S Fiberglass Sousaphone is available with Hard-Shell Case With Wheels (596S).