Seresto Flea & Tick Treatment for Cats Seresto(R) is an alternative to topical flea and tick control. Monthly preventatives are easy for pet owners to forget to apply each month, allowing the chance for their pet to be exposed to flea and tick infestations. Seresto is an easy-to-use eight-month collar, making it effective and affordable for pet owners. It combines two active ingredients, which provide dual action against pests, and continue to protect over eight months. Features: For cats and kittens 10 weeks of age or older Kills fleas and continues to prevent infestations for eight months Repels and kills ticks Odorless Easy to use Item Specifications: Size: Contains one collar Active Ingredients: Flumethrin 4.5% + Imidacloprid 10% Application Instructions: Remove collar from protective bag directly before use. Unroll collar and make sure that there are no remnants from the plastic connectors inside the collar. Insert end of the collar through the buckle. Adjust the collar around the animal's neck without tightening it too tight (as a guide, it should be poassible to insert two fingers between the collar and the neck). Pull excess collar through the loop and cut off any excess length extending one inch beyond the loop.