The Bayer Seresto Large Dog Flea Tick Collar offers 8 months of continuous protection for dogs weighing over 18 lbs. Made with flumethrin 4.5% and imidacloprid 10.0%, this collar is designed with a patented Bayer Polymer Matrix to provide odorless and non-greasy protection. The collar is waterproof and water-resistant, making it suitable for outdoor use. Manufactured in Germany, this product is EPA registered and proven to kill and repel fleas, ticks, and lice, ensuring your furry companion's safety for an extended period of time.