Cat behavior experts recommend a litter box for each cat in your house plus one extra, The corner litter box with its triangular shape fits easily into unusable corner space, Extra boxes will help to eliminate odor problems inside your home by providing another place for your cats to relieve themselves, Triangular shape fits conveniently into corners High sides prevent litter kick out Durable plastic resin ensures long lasting usage Additional litter boxes help prevent litter box problems Works great with the SmartCat Scoop and Holder Case of 5 Color: Gray SKU: SMCT036