BURKINA FASO MOSSI HELMET MASK. Mossi helmet mask from Burkina Faso, West Africa. These masks are traditionally carved from wood and often adorned with pigments and other materials such as shells. The mask features a stylized animal head, possibly an antelope, with a curved horn and a long neck that forms the base of the helmet. Cowrie shells decorate the face of the mask. - Height: 15 inches. Estimate $120-160