Bio Spot Spot On Flea & Tick Control For Cats is a long-lasting topically applied product specifically formulated for cats to prevent and control flea infestations. This product contains Etofenprox which kills biting adult fleas, deer ticks, and mosquitoes your cat may acquire from its surroundings. It also contains an insect growth regulator (IGR), (S) Methoprene, which prevents flea eggs from maturing into biting adults. Each application kills and repels adult fleas, flea eggs, ticks and mosquitoes for up to one month. For cats and kittens over 12 weeks of age weighing 5 lbs. or more. Shipping weight: 1/6 lb.