MAX 40 is a new sustained-release, insecticide ear tag containing a highly concentrated, maximum dose of Diazinon insecticide making up 40% of its volume by weight. MAX 40 has been designed to control the rate at which the active ingredient(Diazinon) is distributed throughout the surface of the animal. This unique controlled-release formulation extends the effectiveness of the tag. The sustained release rate along with the tagâ€™s high potency increases the number of weeks animals benefit from control of horn flies, Gulf Coast ticks, spinose ear ticks, face flies, stable flies, and house flies – up to 20 weeks (5 months). 15 grams.