The YTR-4335, offers some real improvements in terms of playability and a more powerful sound. The 4000 series now comes with a modified two-piece gold brass bell with a thickness of metal that has improved both sound and playability. Newly designed heavier valve caps and buttons give the trumpet more projection and power (monel alloy pistons)  New tuning slides ( 2nd and main tuning slides are produced using the same method as Professional yamaha trumpets_provides stability and refined tonal colour and durability.