PetLock II Large Cat 4 ct

Contains the same active ingredients used in Bayer Advantage II for Cats - active ingredients: imidacloprid 9.10%, pyriproxyfen 0.46%
Kills and controls all flea life stages (flea eggs, flea larvae, and adult fleas).
Waterproof and fragrance free formula.
Kills existing fleas within 12 hours and continues to prevent infestations for up to 4 weeks.