Tri-Zap is a sustained-release ear tag containing a synergized formulation of Zetacypermethrin, a potent, enriched pyrethroid compound and Abamectin, a highly active macrocyclic lactone that has never before been used in combination on cattle, plus the synergist piperonyl butoxide. Tri-Zap is for use on beef and dairy cattle, calves, and lactating dairy cows to control horn flies, face flies, lice, and spinose ear ticks. 1-2 tags per head controls face flies for up to 2 months. 2 tags per head control lice and spinose ear ticks up to 3 months and horn flies up to 4 months. | Y-Tex Tri-Zap Ear Tag 100 Count