Yatao 35pcs/box Bullet Backflow Incense Cones Waterfall Smoke flowers (A:Lavender) Quantity: about 70 pcs/box. burning time: about 15 minutesSpecifications: height 1.18in// 3cm, a diameter 0.47in//1.2cm Shelf life: the longer the storage, the more mellow, Keep it sealed and keep dry. Material: natural sandalwood, backflow incense can produce a lot of smoke, please use it in the condition of no wind The principle of the backflow is high content of tar which has a greater density than air in smoke, so there'll be tar deposit on the bottom of holder after several use. Use: For home, patio, party, wedding, rituals, office, ceremonies, birthday parties, special occasion, romantic moments. but pregnant women and infants should not use