Perfect Compatibility: Compatible with genie cat litter standard and plus pails. Easy To Use: Pull out a little of the refill bag,push it through the center of the cartridge and tie a knot at the bottom.Then open the lid and funnel of the pail,place the cartridge on top,and push the refill bag to the bottom. Odor Contro: Our enhanced 7-layer refill bags with odor barrier technology lock away germs and odors from soiled cat litter to keep your home fresh. Save Money: Each refill cartridge offers 24ft long bag which will last up to 2 months for 1 cat. Included: 12 pack of cat litter refill cartridges. Compatible with cat litter standard and plus pails. Easy To Use. Odor Contro. Save Your Money.12 pack.