These Sandalwood Backflow Incense Cones from HEM are specially made to be used with backflow incense burners. Each cone has a hole in the bottom allowing the smoke to flow downward and through the holder's design like a water would flow from a fountain. To use, light the tapering end of the incense cone. Once it is lit, blow the flame out. Burn on an incense backflow incense burner. Each box includes 40 incense cones.