Adams Plus Flea and Tick Collar for Cats and Kittens kills adult fleas, ticks, flea eggs and flea larvae for up to 7 months. This collar can be fitted for all cats and kittens. Kills fleas, ticks, flea eggs, and flea larvae Kills fleas up to 8 months Breakaway collar Ingredients: Tetrachlorvinphos 14.55%, (S)-Methoprene 1.02%, OTHER INGREDIENTS 84.43%