With good filtering effect;Cut them into various sizes to fit litter boxes,suitable for majority of litter boxes,to odors.Purposes:a good solution to solve the litter box unpleasant smells problem,do the good job to remove odors,maintain and clean smells,keep your pets with good health and mood,make you live a with your pets.Easy to fit:only fit replacement filter into inside vent of litter box top,then the filter works with strong absorbing effect,let the litter box keep and clean smells like a new one.High quality material:eco-friendly activated charcoal material with good absorption,the good effect of filters can last for a long time,disposable filters,it is not recommended that rinse them.Colour:Black Material:activated carbon fiberSize:165*65*15cmPackage Contents:4* Box Filter