Premium activated charcoal litter box filter is made with high quality non-toxic and eco-friendly material to ensure the filters endurance. Premium filter is compatible with Litter-Robot 3 Self Cleaning. Preliminary filter traps large particles such as hair, dust. Foam captures up to 99.97% of particles, odor absorbtion technology, free of VOCs. Our premium filters are made with the eco-friendly non-toxic material to keep your pets as safe as possible. Dimensions: 10 in x 3.25 in x .75 in”, 4 Premium filter included. Suggested to replace 4-6 weeks. 100% customer satisfaction guaranteed. Quality meets or exceeds leading national brands.