The Perfect Litter Box Liner is an extra large, oversized liner that extends over the edges of the Priscilla's Pan. It has an opening to slip over the heart in the back, so that the liner stays in place. Several adhesive stripes are placed strategically on the edges to help keep the liner in place. The Perfect Litter Liner makes cleaning up after your cat(s) a snap! Each package contains 10 Liners.