Make your cat’s health and comfort a priority with the Seresto Flea & Tick Collar for Cats. This long-lasting collar works to kill and repel fleas and ticks for eight continuous months. The fast-acting formula is designed to start working within 24 hours. Seresto kills and repels fleas by contact, so pests don’t have to bite your cat for the collar to be effective. Plus, the adjustable collar is ideal for most cats and kittens ages 10 weeks and older. Seresto offers a non-greasy, hassle-free way to protect your kitty from pests.