Sifting Litter Box Medium Cat Tray. Framed Sifting Litter Pan provided added height and reduced litter spills, easy to clean and strong; hold pan liners securely in place. by G.G.P.C. Great quality Four pan system with detachable sides ideal for medium size size cats All around molded rims for added strengh and stability Sturdy for holding large quantities of litter The high rimmed sides help reduce litter spills Made from odor and stain resistant plastic, and safe for pets.