a,b) A flat, elongated bowl with a broad, almost flat base and a rounded bowl and opening outline at the corners; the narrow edges of the bowl in particular [are] sloping flat towards the outside (type A). There are eight or nine V-shaped slits, six of which [lead] to the string guide. One end of the string is looped into a knot underneath a slot, the other is clamped to the edge of the bowl under the neighbouring tension and also secured with a knot. The resonator is a very high, elongated calabash open at the top. Attached to the string carrier through perforations in the bottom of the bowl and in the calabash wall. Brand patterns [are] on the outer edges of the bowl, extending over the pointed surface of the bowl base. In the bottom [are] round and star-shaped perforations, the former in the corners of the bowl, the latter in the centre line. "Resonance: heia. Strings: tumbira. String carrier: gombo . . . Urori (Suma SO. vom Rikwa)." from Ulrich Wegner: Afrikanische Saiteninstrumente, Staatliche Museen Berlin - SPK, 1984 (appendix object catalogue)