- Intermediate trombone often used by middle school and high school students.
- Has a bright sound and is free-blowing.
- Comes with a 12.51mm (.492") Large-bore slide and a yellow brass bell.
- Has a traditional wrap with open slide.
Yamaha YSL-640
- Intermediate trombone often used by high school students and adults.
- Has a more resonant and darker sound than the YSL-620.
- Comes with a larger 13.34mm (.525") medium-large bore slide and a yellow brass bell.
- Has a traditional wrap with open slide.
- Features larger water key rollers for easier playing and a stronger slide lock for better durability.