Backflow Incense Cones - Galoka £4.95 Backflow cones: [Choose]White SageSandlewoodNag ChampaLavenderRosePatchouli Quantity: at £4.95 each Add To Basket Backflow incense cones have a hole through the centre. When they burn down to where the hole starts, the incense is carried downwards into the burner, creating a pool of incense. It swirls and twists, through the hole of the special back flow incense burner and down to pool at the bottom. These incense backflow cones come in a handy resealable tin. There are 24 cones in each tin with a burning time of approx 20 minutes per cone. A fabulous effect, like dry ice.