1.rich-d-trans prallerthrin powder raw material in it. 2.smokless and good ... time last 8-10 hours Black mosquito coilUsing Metodrich-d-trans prallerthrin as its active ingredient, adding carbon powder to it ... ,but no-irritation to human being. Active ingredient :d-trans prallethrin (it 4times efficiency than d-trans allethrin) Burning time :more than 8hours