These Mossi dolls are executed in different materials, but mostly in wood, hence their name raog'biga (child in wood) or rad'kaba (children in wood). their form is varied according to the region they come from, such as Yako, Ouagadougou, Koupela, Ouahigouya. The main characteristic of these dolls is that they are female; none of male sex has been seen. Serving as educational toys, they are dressed, washed, carried on the back, or placed on the mat, etc., all being activities for education of the child as 'mother' of the doll, carried on under the watching eyes of the mother, aunt, or grandmother. The young 'girl-mother' considers the doll a child (biga) and has to play close attention to it. Hense, any damage to the doll, although accidental, calls for consultation with the diviner, who knows invisible things hidden from ordinary people. For this reason, the Mossi dolls are handled with great care.
The most distinctive characteristic of the individual carving styles is the shape of the head, generally a semicircle with the flat side down. The fertility stimulating capacity attributed to them was their main function, hence, it was not unusual to find females keeping the figurine until she gave birth to her first child.