In a convenient 6 ounce jar, Fly Rid ointment repels flies from superficial wounds and open sores on both horses and dogs. FlyRid Ointment kills flies on contact and keeps them off sores, allowing the wound to heal without fear of infection that flies may carry. This effective fly repelling ointment is effective for hours. Active Ingredients: Pyrethrins - 0.2% Piperonyl butoxide* - 0.50% Di-n-propyl isocinchomeronate - 1.0% An effective yet affordable ointment, Fly Rid Ointment by Durvet is a must have for any grooming kit or first aid kit for the horse owner. Please read the label carefully prior to use.