Description: High-Density SpongeThis U Shape filter cotton is made of high-density sponge foam, matachable with multiple pet fountains as a replacement filter for cat fountains.Good CompatibilityReplaceable cat water fountain filters are versatile and can be used with various types of cat/pets fountain filters, making it a practical addition to your pet supplies.Usage RecommendationFor optimal performance, we recommend soaking the filter in water for 2 minutes before use and thoroughly rinsing under running water. Please replace the filter every 2-4 weeks.Package IncludesEach package comes with 4 pieces of cat fountain sponge filters, ensuring you have enough replacements on hand.Product Dimensions & MaterialEach U Shape filter cotton measures 6.5*3*3cm and is made from high-density sponge material that effectively filters out impurities in your pet's drinking water. Size Chart: 6.5cmx3cmx3cm/2.56inchx1.18inchx1.18inch Package Includes: 4Cat Water Fountain Filters Note: Please allow slightly errors due to manual measurement and different monitors.