Coghlans Mosquito Coils Kills and repels mosquitoes. Each coil will burn six hours or more. Active ingredient: 0.23% d-cis trans allethrin. Specs: 10 coils, two metal stands. Net weight: 4.4 oz. (125 g) The coil is supported in the center where it is suspended in air and wedged between fir resistant mesh for continuous burning of incense. The smoke itself will prevent mosquitoes from coming to close to area, all while producing a pleasant scent for the human.