Largest version, single-sided. C major or wood body/nickel tremolo tuned harmonica. 12 double-holes. 48 reeds. Create a pleasant harmonica sound without being able to play single notes. Length: 7-1/8″ (photo is of a smaller version Echo).
Please note that this type of harmonica is not commonly used or recommended for most beginning harmonica instruction (a standard 10-hole diatonic is what you would want).