Cylence Pour on, 1 pint (473ml) size. CyLence Pour-On Insecticide is a ready-to-use solution for the control of horn flies, face flies, biting lice and sucking lice on beef and dairy cattle (including lactating). CyLence can be used any time of the year, and only a small amount of material is required per treatment. It can be used on cattle of any age or size with no meat withdrawal requirements. Apply the required amount of product directly along the top of the back and top of the head of the animal. No mixing is required. Thanks for looking and have a fine day.