The PETSWORLD Cat Pad Refills are designed to be used in conjunction with the Tidy Cats Breeze Litter System. These pads have been redecorated and are now made of a high-quality, soft PVC material that is resistant to leakage and spreading. They also feature a double-sided design that provides more surface area for odor absorption. The PETSWORLD Cat Pad Refills are available in a 100-count pack and can be used in any litter-box system that has a capacity of up to 4 liters.