Vetoquinol offers Eliminator ear tags, they can be used in beef dairy and veal cattle. (Vetoquinol, 2000). Eliminator ear tags are slow release insecticide applied to the ear of cattle for season long protection of face and horn flies (Vetoquinol, 2000). The tags are applied to the ear of the cattle, the female and male parts of the tag are pinched together through the ear using an Allflex tagging system™ (Vetoquinol, 2000). The application of the ear tags needs to be completed with care. When applying the ear tag the applicator needs to wear chemical-resistant, when applying and removing the Eliminator Ear tag. Avoiding contact with eyes skin or mouth (Vetoquinol, 2000). Eliminator ear tags contain 6% Cypermetherin and 11% Diazinon. (Vetoquinol, 2000) Cypermetherin is part of the synthetic pyrethroid family of insecticides. This insecticide paralyzes, and knocks down the horn fly immediately upon contact. Diazinon is part of the organophosphate insecticide group, that does not knock down horn flies immediately it takes a contact time of 1-2 hours for the horn flies to obtain a lethal dose. (Wright, 2006) Both insecticides reduce the burden of face flies on cattle, (Vetoquinol, 2000). Applying one tag will reduce the face flies but a tag in each ear will eliminate horn flies (Wright, 2006) Eliminator ear tags are manufactured by Vetoquinol and then sold to various retail farm and distributing stores. Each distributor has a different price on the ear tags, the lowest cost found was $69.95CND for a box of 20 tags located at Farmers Farmacy. Other prices range to over $100CND. The Allflex tagging system is needed for application of the ear tags, it is made in Texas. The price of the Allflex tagging system can be found for the lowest cost of $27.95 from an online distributer as well.