2 sets of carbon filters for kitty litter box NIB

Kitty Litter Box Carbon Filters Fix3 2 sets of 2 filters (2 boxes) Made in Italy by Marchioro New in box [pun not intended, has not been in a litter box :-) ] See photos for size. I used them in any litter box that has vents. Replacement filters to remove unpleasant odors. Filters remain active between 3 and 6 months depending upon conditions. Note the boxes have wear. Stored in a non-smoking, pet friendly home.