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Ekolowa mouth bow of Ovimbundu (or Vachokue) Another musical bow named ekolowa is of simple construction, consisting of a strip of cane from 54 to 70 cm long and 2 cm wide. At each end of the cane is a projection. A string, when tightly stretched between these projections, pulls the cane into the form of a bow. The performer, placing one end of the bow in his mouth, plucks the string with his thumb and forefinger (Plate XXII, Fig. 7).