Features: High-Quality Material: The cat fountain filter is made of high-quality non-woven fabric, and the water is deeply purified, making it safer, practical, and durable. Fountain Replacement Filter: Our cat water fountain filter is easy to remove and clean,will remove impurities and odors, and keep your cat& 39;s drinking water fresh, clean, and safe, which is of great benefit for healthier pets. Health Helper: Our pet fountain replacement filters, which contain ion exchange resins that soften hard water by removing magnesium and calcium, can encourage your pet to drink water more and more. Fountain Accessories For Pet: Our cat water fountain filter is a must-have accessory for your pet& 39;s fountain. Own it and provide a healthy environment for your beloved pet. After-sale Service: If you have any questions, please contact us immediately, we will help you solve it as soon as possible. Specification: Material: Non-woven fabric Size: 9.3*5.5*10.6cm/3.66*2.2*4.17inch 1 box (4 runway filters + 4 ring filters)