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Contains a topically applied long-lasting insect growth regulator (IGR) specifically formulated for cats and kittens more than 12 weeks of age. Formula prevents flea eggs from maturing into adults. A single application will last up to one month and provides relief from flea infestations for one month by controlling and preventing flea eggs--breaking the flea life cycle. Has an easy to use, no mess disposable applicator for quick treatment. Applicator is long so it makes it easier to apply to long haired cats, too.Package contains four monthly doses, each 1cc (one monthly dose).Do not use on kittens less than 12 weeks old.Active ingredient: (S)-methoprene (CAS# 65733-16-6) 3.6%. Other ingredients 96.4%.