These filters offer solutions for removing the odor produced by cats litter box. These filter pads are safe and reliable to use, friendly to cats, and they support long-term use, more convenient to the cat owners. These filter pads match various types of litter boxes. Features -Color: Black. -Material: active carbon -Size: About 11.50X10.50X0.50cm/4.52X4.13X0.20in - Effective filter: Our filter pads can effectively reduce the odor concentration, creating a pleasant environment. - effect: Each filter pad can work for a long period, no need for daily replacement, saving your time and labor. - Universal filter: These filter pads have proper sizes, and you can combine them according to actual needs, suitable for all types of cat litter boxes. - Reliable to use: These litter box filter pads are safe and reliable, have no bad impacts on your cats, bring much convenience. - Easy to use: You just need to place the odor filter pads into or near the litter boxes and you can enjoy a living environment without bad smells. Package list: 18 x filter pads