Specially designed for Catit Design SmartSift, these replacement liners make managing the cat's litter very convenient. Easy to install, the liners are designed to fit perfectly in the cat pan base._x000d_ They are very effective at preventing waste clumps from sticking to the surface of the base, making cleanups so much easier. When the liner is full, simply remove and discard it._x000d_ 12 liners per pack