The 321 features a strong warm tone, and is easy to play, with accurate intonation.
Specs
| Model | YEP-321S | YEP-321 |
| Key | Bb | Bb |
| Bell Material | Yellow brass | Yellow brass |
| Bell Diameter | 280mm (11") | 280mm (11") |
| Bore Size | 14.5-15.5mm (0.571-0.610") | 14.5-15.5mm (0.571-0.610") |
| Height | 664mm | 664mm |
| Valves | 4 top pistons | 4 top pistons |
| Finish | Silver-plated | Clear lacquer |
| Mouthpiece | SL-48S | SL-48S |
| Case | Included | Included |