Characteristics Seresto has been developed using an innovative mechanism of action: the active ingredients of Seresto are released constantly and appropriately for up to 8 months, offering your cat up to 8 months of protection against fleas and ticks. It can be applied to kittens from 10 weeks of age. By protecting your cat, Seresto® can help protect your home Up to 8 months of protection Designed for the most adventurous cats with a safety mechanism Eliminates fleas and ticks on contact, without needing them to bite your cat Protecting your cat can help protect your family Unscented, so nothing gets in the way of pampering. One worry-free app Composition (active ingredients) The 38 cm collar (12.5 g) contains 1.25 g of imidacloprid and 0.56 g of flumethrin.