Value pack of 8 filters.Compatible with YOUTHINK, HOMMI, ISYOUNG, KOALAD, HAPPYPAPA, PEDY, DADYPET, automatic flower fountain and other of same size. Size: 5in(outer diameter), 1.5in(inner diameter).Dual-action filters: Resin and active carbon. Resin can soften water and reduce the chance of lithiasis. Activated carbon can adsorb impurities and odor, keep the water fresh and clean.Water quality can be removed by the three 3 types of filtration. The external cotton layer on each filter captures hair and debris. Three steps of filtration can assure the quality of the water and enhance the taste of fresh water for your cats.Rinse the filter with water thoroughly before using, easy to mount it on pet water fountain.Specification: Name: Cat water fountain filter Inside material: Activated carbon, resin Size: Outer diameter: 127mm/5in, inner diameter: 38mm/1.5in, thickness: 8mm/0.31in Package Information:  Package size: 14 * 8 * 13cm/ 5.51 * 3.15 * 5.12in Package weight: 120g Gift Box Packaging Package List: 8* Cat water fountain filter