Adams Plus Flea & Tick Collar For Cats – Unique breakaway collar provides 8-month flea and tick protection for cats and kittens 12 wks and older. Kills fleas and ticks, including those carrying Lyme disease; kills flea eggs to prevent reinfestation. Features Precor Insect Growth Regulator to break the flea life cycle. Breakaway feature allows cat to safely break free in emergencies. Contains 10% propoxur.