The Seresto 2-pack cat flea collar for cats 10 weeks of age and older provides continuous 8-month flea and tick protection. Unlike oral flea and tick prevention products that require fleas and ticks to bite your pet to work, Seresto flea and tick collar for cats kills fleas and ticks through contact?no biting required. Seresto flea and tick prevention is also available for dogs. This Seresto 2-pack of flea and tick collars for cats contain two active ingredients: Imidacloprid to control flea infestations and flumethrin to repel and kill ticks. These active ingredients are slowly and continuously released in low concentrations, spreading from head to toes, even the tail, over your cat?s coat and skinch Seresto 2-pack 8-month tick and flea collar for cats can be used alongside other identification collars. Avoid the hassle of messy monthly treatments and get the effective protection of Seresto flea and tick collars.