The Whisker OdorTrap is a 6-pack of replacement odor filters designed to effectively eliminate litter box odors. Made by the trusted brand Whisker, these units are sealed and ready to use. With free shipping included, pet owners can easily combat unpleasant odors and maintain a clean and fresh environment for their feline companions. Made in the United States, this product offers a convenient solution to keep litter boxes smelling great. New N Package with Free Shipping.