Features: Soften water quality and remove impurities with this set of 4 pet water fountain filters made from coconutshell activatedcarbon, cationic resin, and cotton pads With multiplelayers of filtration, these filters ensure clean and freshwater for your furry friend eachtime Designed for petowners who want to provide their pets with the great quality drinking water possible. These filters are perfect for use in automatic 4L capacity pet water fountains or any other type of pet water dispenser. Keep your pet healthy and hydrated with these great quality, long-lasting pet water fountain filters. Specifications: Material: ActivatedCarbon, cotton Product Size: approx. 12x8.4cm/4.72x3.3inch Package Includes: 4 xPetWater Fountain Filter 16x Filter Cotton note: Please allow 1~2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.