Wikipedia
The sasando, also sesando or sasandu, is a harp-like traditional music string instrument native to Rote Island of East Nusa Tenggara, Indonesia.
The name sasando is derived from the Rote dialect word ”sasandu”, which means "vibrating" or "sounded instrument". It is believed that the sasando had already been known to the Rote people since the 7th century.
The main part of the sasando is a bamboo tube that serves as the frame of the instrument. Surrounding the tube are several wooden pieces serving as wedges where the strings are stretched from the top to the bottom. The function of the wedges is to hold the strings higher than the tube surface as well as to produce various length of strings to create different musical notations. The stringed bamboo tube is surrounded by a bag-like fan of dried lontar or palmyra leaves ( Borassus flabellifer), which functions as the resonator of the instrument. The sasando is played with both hands reaching into the stings of the bamboo tube through opening on the front. The player's fingers then pluck the strings in a fashion similar to playing a harp or kacapi.
The sasando has 28 or 56 strings. The sasando with 28 strings is called sasando engkel and sometimes has 56 strings, called double strings.