This rite is performed in homage to the Garou's totem spirit. Each spirit has a different rhythm connected to it, and the Garou taps out this rhythm with special drumsticks to honor her totem. Such "sticks" are traditionally made of bone, but can be fashioned from any material.
Any Garou who performs this rite three times per day for at least three consecutive days gains an additional die to any one roll while in the spirit Realms. Once this die is used, the Garou must rebuild the energies for an additional three days before regaining the extra die.
Source: Werewolf the Apocalypse