The abalone shell is traditionally used to burn herbs and smudges. A stick can be leant against the edge while still alight. (Of course, never leave it unattended).
Environmental info: These abalone shells come from South Africa & Mexico. They are farmed and are not caught in the wild. This means natural habitat is not destroyed and the supply is sustainable.
Approximate size is 4.5" to 5.5" (11cm to 14cm) at the widest point