This particular mask is used in male initiation rites, which often include male circumcision and elaborate village dances. Sometimes magical substances that cause injury or heal are stuffed into those massive horns. The Kuba's art represents figures from their history. This particular one is quite detailed, having wrinkles carved into the cheeks and brow. Its size would engulf someone's head, even beyond the ears.
Various beads outline the facial features and animal skins and fur top the head.
It's intellectually intriguing, if not diverse.