UPGRADED LITTER BOX FILTER, More Carbon Higher ppi Filter Greatly Improves The Blocking and Absorbing Efficiency.4-PACK OF FILTERS provides up to 12 months of litter deodorizer, with each lasting up to 3 months. Keep your litter box conveniently located without subjecting family and guests to pungent and unpleasant box odors.CARBON PAD FILTERS. This provides a greater surface area for odor absorption. Pads are trimmable with scissors to accommodate most any brand of hooded litter box.NATURAL AND NON-TOXIC odor control eliminates litter box smells while giving you peace of mind. Inserted in the vented filter compartment, these pads work discreetly without your feline friend even realizing they are there.EASY TO INSTALL in just seconds, Litter Charcoal Filters are eco-friendly and biodegradable. Toss out the old filter every 2-3 months and replace it with a new one to keep litter box odors at bay.Model Number:Pet Litter Box Filtercolor:BlackMaterial:fibersize:165 x 153 x 10mmPackage Contents:4 x Activated Carbon FilterOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.