Getzen 3508 Trombone
From the manufacturer:
All Getzen Custom Series Trombones are based on the best designs from the Getzen ProShop. Custom Series Trombones are designed to offer players the ability to choose between different bells and leadpipes. This allows the player to customize their trombone to deliver the desired sound and response. Custom Series Trombones are ideal for college music majors and top professional trombonists.
The 3508Y Custom Series Jazz Trombone features a .500"/.508" dual bore slide and a yellow brass bell. The outside hand slide is lightweight nickel silver with yellow brass end crooks. Players may customize the resistance, sound and response of their setup with the three interchangeable leadpipes that come with the instrument.