Additive-Free Insect Repellent Incense Sticks - Kikka Senko Natural Incense Sticks These insect repellent incense sticks are made with natural pyrethrum, a plant in the chrysanthemum family, as their main ingredient. They do not contain any synthetic pyrethroid insecticides like those found in commercially available products. These incense sticks repel mosquitoes with the ingredients found in pyrethrum (repellent effect). Burning time: Approximately 6 hours indoors. ■ Contents: 30 rolls ■ Ingredients: Pyrethrum, pyrethrum powder, pyrethrum stem powder, tabu powder, wood flour, starch