The Bach Aristocrat BATB600 Student Bb trombone has a .509″ bore and an 8″ two-piece yellow brass bell that result in an open and broad warm sound. The chrome plated nickel silver inner handslide tubes provide the ideal surface for smooth and quick handslide action. The clear lacquer finish provides a subtle warmth to the overall sound. The TB600 is a well designed durable instrument perfect for the beginning student and is well suited for all types of music.