Super Deckem Insecticide Ear Tags contain 10% Permethrin. Use 2 tags per head for up to 5 months control of horn flies, face flies, gulf coast ticks and as an aid to control lice, stable flies and house flies. For use on beef and dairy cattle (including lactating) and calves over 3 months of age. Apply with Duflex or other brands of applicators. 24 tags per package - blue.