AR Resonance Backbore GR1 Bronze Trombone
Mouthpiece Backbore for Trombone

Technical Data
- Manufactured by AR Resonance
- Large shaft
- Bore: 7.2 mm (72)
- Backbore: Standard
- Weight : L (light = standard)
- Material: Bronze
- Silver-plated
- For experienced trombonists
- Made in Italy