OPtimizer is an economical organophosphate tag containing 21.4% diazinon that performs well in areas with horn fly pyrethroid resistance. Controls horn flies, Gulf Coast ticks, spinose ear ticks, lice and aids in control of face flies up to 5 months with two tags per head. Approved for use on beef and non-lactating dairy cattle. OPtimizer is ideal for rotation with PYthon? to help manage horn fly resistance to insecticides.Cow size, 15 gram. Bright orange color. Apply with Y-Tex applicator (hollow) pin.