Package Included: You will receive 8 pieces of Black PET Fountain Sponge Filter Replacements. Sufficient quantities to meet your pet’s drinking water needs. Size: These pet sponge filters are 6.5 x 3 cm and replacement pet sponge filter is compatible with the 2.5L cat water dispensers. (Please confirm the size before purchasing.) Premium Material: These cat fountain filters are made of high quality polyurethane sponge. high quality, which provides good water purification effect for pet drinkers, allowing your pets to drink water. Clean Water, More Willing to Drink. Filters Impurities: This filter sponge filters out impurities, especially debris like pet hair, ensuring that every drop of water your pet drink is clean. The filter sponge can extend the life of the water supply pump. Tips: The filter sponge is not suitable for repeated use, because some impurities after filtering will remain on the sponge , it is recommended to replace it every 2-3 weeks. Scope of delivery: 8 cotton water