With lemongrass, citronella, rosemary, thyme and geranium oil, these natural incense sticks effectively repel insects when lit, while providing a pleasant fragrance. To protect your outdoor enjoyment, place them around your backyard barbecue, picnic, campsite, etc. Each box holds 10 sticks and two metal holders. Each stick lasts for about an hour after being lit. The number of sticks to use for maximum effectiveness depends on the area you want to protect and the amount of wind. Our suggestion is to light one, then add more as needed.