Professional model, half-automatic system.
Silver-plated keys, double F key (left hand F) and double low C key, 3rd octave, forked F resonance key, low C to C# and low B to C# trill keys, C to Eb trill, C to E trill ring, independent connection from low B to low C.
Made with selected Grenadilla Ebony wood or Rosewood naturally seasoned for eleven thirteen years.
Two bocals included.
Thumb plate system.