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| YBB-321 | YBB-321S | ||
|---|---|---|---|
| Key | Bb | Bb | |
| Body | Yellow brass | Yellow brass | |
| Bell Diameter | 443mm (17 1/2") | 443mm (17 1/2") | |
| Bore Size | 18.5-19.5mm (0.728-0.768") | 18.5-19.5mm (0.728-0.768") | |
| Height | 1018mm | 1018mm | |
| Valves | 4 top pistons | 4 top pistons | |
| Finish | Clear lacquer | Silver-plated | |
| Mouthpiece | BB-67C4 | BB-67C4 | |
| Case | Included | Included | |
