This item is 9.0 ml Elector PSP in a single use dropper bottle.
The 9 ml concentrate must be diluted in one gallon of water and will treat at least 50 chickens. 
ABOUT 
Poultry veterinarian recommended Elector PSP is the most effective, safest, easiest solution to eradicating mites and lice in your flock with NO egg WITHDRAWAL period! Elector is safe for you and your pet chickens. Due to its multiple mechanisms of action, mites and lice do not develop resistance to it.  Elector PSP, in the spinosyn class of insecticides, acts as both a larvicide and an adulticide, killing adults and their nits after ONE application when used properly.
Must be stored in a cool, DARK location until use; light degrades the active ingredient.