The Hohner Mini Harmonica Necklace It's easier than ever to make music wherever you go! When you wear Hohner's Mini Harmonica Necklace, a tune is never far from your lips. The fashionable necklace holds a four-hole harmonica with eight reeds and is just 1 3/8" long, yet plays a full octave. Strung on black cording with colorful beads and silvertone accents, this little harp features genuine brass reeds and stainless steel covers.