The 3 smaller ones, whilst possibly also used for carrying gunpowder, were probably used as snuff containers.
Snuff containers are still used by diviners, as tobacco is a tool for communicating with the ancestors. It is used in divination to put the diviner in contact with the spirits.
Snuff containers are objects of great elaboration & ornamentation. Tobacco was smoked, snuffed, & chewed. The tobacco snuff was often mixed with ashes of other plants, minerals, & animal fats. This intense mixture was taken rapidly to induce intoxication. While it may be a personal pastime for some, tobacco in Africa is widely associated with public ceremonies, social etiquette, & the recognition of rank differences. For example, it may be used in greeting or as part of wedding ceremonies.
Dimensions from left to right:
Height: 5 1/4" x Diameter: 3 3/4"
Height: 5 1/4" x Diameter: 2 7/8"
Height: 4 3/4" x Diameter: 2 1/4"
Height: 4 3/4" x Diameter: 2 1/8"
Only sold as a set of 4.