XP 820 Insecticidal Ear Tags from Y-Tex are for use on beef and dairy cattle, including calves and lactating dairy cows. Control horn flies (including pyrethroid- and organophosphate-resistant populations) and gulf coast and spinose ear ticks, aid in the control of American dog, cattle fever, and Lone Star ticks, and reduce face flies. Unique, slow-release tag contains patent-pending formulation of 20% piperonyl butoxide and 8% abamectin. 11 independent studies have shown using XP 820 offers an average calf weight gain of 52.4 lbs vs untreated animals. Use 2 tags per head to control horn flies for up to 5 mos, gulf coast ticks for up to 4 months, American dog ticks for up to 3 months, cattle fever ticks for 2-3 months, and Lone Star ticks for 2 months, to aid in control of spinose ear ticks for up to 3-4 months, and to reduce face flies. 1 tag per head provides control of horn flies for up to 3 months. Y-Tex patented Snap-Lok collar guarantees retention against tag or button failure for up to 5 months. Use Y-Tex Applicator. Metallic gold tag.