The endogamous caste of "Azza" (or "Aza") among Toubou have the artisanal occupations, such as metal work, leather work, pottery and tailoring, and they have traditionally been despised and segregated by other strata of the Toubou, much like the "Hadahid" caste in southeastern Chad among the Zaghawa people. Marriage between a member of the blacksmith caste and a member from a different strata of the Toubou people has been culturally unacceptable. The strata locally called "Kamadja" were the slaves. The language used by the Azza people is a variant of the Tebu language, but mutually intelligible.