Sufficient quantity: each set comes with 300 pieces of backflow incense cones of 10 different natural smellsNatural material with natural fragrances: the backflow incense cones are made of cedar powder and natural plant powder that release natural and fresh fragrances, making your place smells good and fresh; each piece can stay about 10 minutesThe backflow incense cones have 10 different fragrances of 10 colors, and each color represents a smell, sandalwood (khaki), rose (rose red), lavender (purple), lily (red), jasmine (yellow), green tea (green), ocean (blue), lemon (orange), mint ( light green), sweet-scented osmanthus, enough for you to choose and use differentlyThe backflow cones need to be used in an reflux incense burner; each piece has a hole on the top to make the smell goes down naturally, it can release your pressure and make you relaxedSuitable places: the backflow incense cones can be applied to most less windy places, such as home, office, kitchen, bedroom, yoga room, meditation room and more; please keep away from winds to prevent smoke from spreading everywhere