Spot-on flea & tick control for cats & kittens. Convenient, waterproof spot treatment that kills fleas & ticks for up to 4 weeks (each carton contains 3 month supply). Prefurred® ONE also kills chewing lice & controls mites that may cause sarcoptic mange. Contains Fipronil which is the same active ingredient used in Frontline® TopSpot® for dogs. This product can be used on kittens 8 weeks of age or older.