The Whisker Litter Robot 4 Carbon Filters 6 Pack is a set of replacement odor filters specifically designed for the Whisker Litter Robot 4 model. These filters are made to last for 6 months and effectively reduce odor to keep your litter box smelling fresh and clean. With the Whisker brand known for quality pet supplies, you can trust that these filters will help maintain a healthy and comfortable environment for your furry friend.