Jupiter JBR1000MS 1000 Series Marching Baritone Horns - Key of BbThe Jupiter JBR1000MS Marching Bb Baritone features a . 500 inch bore that allows excellent projection and support of sound without taxing the player. The JBR1000MS also features an adjustable 3rd slide with finger ring. 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