Backflow cones have a hollow tunnel in the middle. Use a special backflow incense burner with these, and the smoke will pour out through the bottom and down the burner like a waterfall. This kit includes the nice oak display rack, and two bags of cones for each fragrance, with labeled jars (total of 50 cones for each of the twelve scents). It also has an acrylic price sign, zip seal bags to sell them with, a window sign, and a UPC card to scan at the register. Backflow cones made by the famous Wildberry brand. Wildberry makes only the BEST quality incense!