Professional Bb/F Tenor Trombone, open wrap, L-bore- Key: Bb/F- L-bore: 13,9 mm (0,547")- Open wrap- Body material: Brass- Bell: Brass- Bell diameter: 21,5 cm (8,46")- Inner slide: Chrome plated nickel silver- Outer slide: Nickel silver- Hand slide bow: Nickel silver- Water key- Mouthpiece: silver p..