This Portable Harmonium is a very well-crafted instrument and ultra-portable. The keyboard is an 2-1/2 octaves, which is sufficient for most players. It is made of pineIt has two sets of reeds, bass and male, and a double-fold foil bellows. It has four knobs: two to control air flow through the playing reeds,and two extra drone notes. The harmonium folds down to 7 x 11 x 18.5 inches when collapsed, and weighs only 16 lbs.It includes a well-designed black nylon carrying bag. This is the lightest and most portable harmonium we have.