Catit Hooded Cat Pan Replacement Carbon Filters are for use with the Catit Hooded Cat Pans, Catit Jumbo Hooded Cat Pans, and Catit Style Jumbo Hooded Cat Pans (Art. # 50700, 50701, 50702, 50722, 50695, 50696). High quality carbon impregnated polyester insert removes odors from the litter pan. The highly active carbon pad's large surface area traps odors passing through the filter, keeping the litter pan smelling fresh and clean. Package of 2.