Formula 707 MultiFly Feed-Thru Fly Control Pellets for Horses - Palatable & Safe Fly Population Reduction (10 lb Bag - 182 Servings)EFFECTIVE Contains active ingredient Novaluron, which is an Insect Growth Regulator. This new generation technology is 99. 9% effective at breaking the fly life cycle to help eliminate the fly population in your barn. SAFE Unlike other brands, our active ingredient is not an organophosphate, and is completely safe for horses. PALATABLE Administer one serving of our alfalfa and wheat midd based pellets to your horses daily with their feed. AFFORDABLE