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Which jews harp is best for a beginner?

TK248 "Hoa Binh" Dan Moi

TK248 "Hoa Binh" Dan Moi
Vietnamese Dan Moi /
Oberton Pro Lab measurements:
Gaps: 70-100 µm (?)
Base frequency: 50-55 Hz (?)
Frame hardness: 1000-5000 gf (?)
Reed size: 70x0 mm
Overall dimensions: 110x10x2 mm (?)
Weight: 10 g (50 g with case)
Modern version of ancient lips jews harps construction, made of metal instead of wood and providing higher reliability. Sound producing requires special training and is harder to master than any other type of jews harps. While not providing any obvious advantage over them, it looks like collector's instrument mainly.