The Beaphar cat flea collar contains a insecticide that kills fleas on your cat and stops them from re-occurring for up to 4 months. Effective, comfortable and fashionable, this collar features a sparkle design and a silver bell so you can hear when your feline friend is nearby! Fully adjustable to fit any cat. Suitable for cats and kittens over 12 weeks of age. lasts up to 4 months.