These are compatible with Litter Genie and Cat Genie Disposal Systems. Better Value than the Competition This box contains: 4 refills per boxEach disposable refill cartridge has 21 feet of capacity Pet owners love theserefill cartridges! This box last up to one year based on one cat. They aremore budget friendly than others, leaving more money in pet owners pockets tospend on the cat or dog. Tough Material and Easy to Change Ourstrong liner wont tear when its full but is easy to cut with the cutter onthe inside door of the pail. Change the liner extremely quickly and hasslefree. No Stinky Poo Smell The odor lock refills features 7 distinctlayers that work together to lock in and seal odors and germs. BONUS PetPotty Training Ebook Utilize our free guide to help youre little doggy andkitty achieve potty training success.