King 3B Bb Tenor TromboneThe King 3B trombone is built with a classic jazz trombone style in mind. It features a . 508 bore for excellent control in all ranges of the instrument. The yellow brass bell offers a quick response. A vintage balancer and deluxe style bell engraving are included on this trombone. A sleek hard shell case protects this trombone when not in use. These king small bore straight trombones have set the standard in jazz performance for generations.