Bayer - 40% organophosphate ear tag contains 20% dry (coumaphos) and 20% liquid (diazinon) active ingredients. For use on beef and non-lactating dairy cattle to control horn flies (including pyrethroid resistant horn flies) Gulf Coast ticks, Spinose ear ticks and as an aid to control face flies. Bright white for easy field visibility. Allflex Global System. Not for calves less than 3 months old. 13gm.