This insecticidal strip will help take care of your pest problem. Defends mainly against Northern Fowl Mites It comes with a "C" clip for easy hanging. You only need one strip per nest box for a max of 5 birds. Not to be used with Natural or Synthetic Pyrethroids on a farm. Can be used for a commercial layer, broiler breeder or layer breeder. The strip is made with Permethrin. Strip will last up to 2 years.