For use on beef and non-lactating dairy cattle to control horn flies (including pyrethroid-resistant populations), gulf coast ticks, spinose ear ticks, lice and to aid in controlling face, stable and house flies. Unique controlled release formulation extends effectiveness of tag. Sustained-release rate and tag's high potency controls targeted pest for up to 5 months. | Y-Tex Max 40 Insecticide Cattle Ear Tag 20 Count