Elanco Seresto Cat Flea & Tick collar provides the performance you expect from topicals, in a collar! The Seresto Flea and Tick Collar provides 8 months of prevention and treatment against fleas and ticks for cats and kittens 10 weeks of age and older. Contains 4.5% flumethrin and 10% imidacloprid. The Seresto Collar's unique polymer matrix ensures that active ingredients are released slowly and continuously in low concentrations. Collar should be worn continuously; no need to remove for bathing. Seresto collar kills fleas on cats within 24 hours and prevents flea infestations for 8 months. Seresto collar prevents tick infestations within 48 hours and repels and kills ticks for 8 months. Re-infesting ticks are repelled and/or killed as quickly as 6 hours. Seresto collar kills chewing lice for 1 month and aids in treatment and control of sarcoptic mange.