Jupiter JBR1000M 1000 Series Marching Baritone Horn - Key of BbThe Jupiter JBR1000M Marching Bb Baritone features a . 500 inch bore that allows excellent projection and support of sound without taxing the player. The JBR1000M also features an adjustable 3rd slide with finger ring. Features Lacquered Brass Body is produced using state of the art technology to ensure an instrument of the most accurate scale and playability Stainless Steel Pistons have remarkably smooth, fast action for improved agility and