Seresto Cat Collar Pack of 3 units Features Seresto was developed using an innovative mechanism of action: the active ingredients in Seresto are released consistently and appropriately for up to 8 months, providing your cat with protection against fleas and ticks for up to 8 months. 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 the need for them to bite the cat. Protecting your cat can help protect your family Fragrance-free, so nothing stops you from pampering yourself. A worry-free app Composition (active ingredients) The 38 cm (12.5 g) collar contains 1.25 g of imidacloprid and 0.56 g of flumethrin.