harmonica qimei little doctor 24-hole polyphonic c key octave harmonica harmonica c key echo harmonica qimei harmonica wholesale

Dual-tone harmonica with two rows of holes, producing the same note. The pitch is the same. The bass harmonica has two rows of holes with an octave difference, with the lower row being an octave lower than the upper row. The echo harmonica has a tin cover on the back, which reflects the sound when blown, creating an echo effect.Echo effect, but without the vibration sound effect.

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