About POPETPOP Cat Litter Box Filter This is a set of 8 pieces of cat litter box filters. Made of activated carbon that make sure safe and environmentally friendly. Helps eliminate odors from the litter box. It can be trimmed to your desired sizes and fit well for dome cat litter box and most other cat litter box with different shapes. Features - Color: Black. - Material: Activated carbon. - Filter Size(LW): 6.5 X 6 Inches - Filter Thickness: 5 mm Warm Tips: 1. Do Not rinse. 2.Please replace the filters every 2-3 months. Package Including 8 x POPETPOP Cat Litter Box Filter