Octave without stopper multifold bellow special heavy fitting, big back wall, coupler A440 international scale tunning harmonium. A440 pitch – rosewood colour set of 2 “reeds” reeds: 1 base + 1 male for rich sound 3 1/2 octaves total 42keys coupler function – helps to play two octaves of the same note at the same time and produces richer sound a440 pitch – rosewood colour set of 2 “” reeds: 1 base + 1 male for rich sound 3 1/2 octaves total 42keys coupler function – helps to play two octaves of the same note at the same time and produces richer sound. package contains one without stopper harmonium, black colour one padded gig bag one harmonium