I rarely if ever say WOW!, this is a great product, but I will now. The flies have almost disappeared since we started using this. They say the garlic on the lips repels flies, and in their system makes them not appealing to flies. Can't use with milking dairy because it will make the milk taste funny. But I am sold on them for my herd. The calves are enjoying it too. They manufacture the tubs locally for me, so I go right up to the place and get mine.