Detailed size: These pet fountain foam filters are about 1.08 inches (27.5 mm) wide, 2.12 inches (54 mm) long and 0.55 inches (14 mm) thick, please pay attention to the size before you buy to prevent buying the wrong one. Package include: You will receive 30 pieces of cat water dispenser sponge filters in sufficient quantity to meet your use and replenishment replacement needs, which can provide clean drinking water for your pet. Quality material: Our pet water dispenser filter is made of sponge, which provides good filtration for pet water dispenser and improves the water cleanliness, so your pet can drink clean and fresh water. Replacement frequency: Rinse the pet water dispenser filter with running water before use, then install the sponge filter into the dispenser. To keep the water clean and healthy for a long time, you should preferably replace the sponge filter every 2-3 weeks. Keep your pet healthy: These sponge cat fountain filters can filter accidentally entered hair and food debris, making the water cleaner and healthier, so your pet becomes more fond of drinking water and becomes healthier.