ready:Backflow Cones for Yoga Room is supposed to be a practical present for your friends and families who are keen on zen and yoga Material:Backflow Incense Cones made of pollen is natural,harmless,eco-friendly,and long-lasting for long term use Function:Backflow Cones Set helps to purify the air, meditate and relax, relieve stress, improve sleep situation, etc. Widely used:Backflow Cones for Incense Burner are suitable for use at home, on the terrace, for incense, ceremonies, offices, birthday parties and romantic moments, etc. Specification:The package includes 30 Backflow Cones,and each Backflow Cones can last for 8-10 minutes (for reference only)