1， Model trumpet. The product perimeter 60mm， suitable Coronal inner perimeter

2， the models numbers. The product perimeter 72mm， suitable for the Coronal perimeter 72-90mm. Suitable for medium and larger by JJ.

3， model tuba. The product perimeter 82mm， fit inside circumference ≥ 82mm Coronal. Suitable for Europe， the United States and Africa， and JJ King who.