| AR Resonance : Backbore GR1 Bronze Trombone
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Description from Thomann :
- AR Resonance Backbore GR1 Bronze Symphonic Trombone (S); mouthpiece backbore for trombone; large shank; throat size: 7.2 mm (72); internal size: Standard; weight: L (light = standard); material: Bronze, silver plated; for experienced first trombones; made in Italy