The King 2B Plus Legend Series Trombone has a .500-inch bore which makes it slightly larger than the standard 2B. This makes the 2B Plus ideal for all-around jazz and big band music. Additionally, the slide has characteristic smooth action and is made with brass outer and chrome-plated inner slides. The bell of the 2B Plus measure 7-3/8-inches and is available in yellow brass, gold brass, or sterling silver.