Farnam Repel-X PE Fly Spray Concentrate is an excellent product we know our customers will love. Economical protection from biting and bloodsucking flies, gnats and mosquitoes. Repels horn flies, house flies, stable flies, horse and deer flies. Kills on contact. Each pint of concentrate makes a gallon of finished spray. Ingredients: Active Ingredients: Prallethrin 0.27%, And Piperonyl Butoxide 1.00%.