Features: brand new and high quality 4 pieces pack sponge foam filters. Good protection: If too much debris or hair flows into the pump, the pump will make noise when it is working. The fountain pre-filter sponge can protect the pump more effectively and prolong the service life of the fountain. Pre-filter foam removes hair, dirt, and food particles before the water goes to the pump. Replace the filter every 1-2 weeks to maintain your pet fountain. Sponge foam filters can be washed and reused. More frequent replacement is required if multiple cats use the fountain. Replacement foam filters for Round and Cubic Top Stainless Steel for Cat Fountain, for Cat Flower Fountain. Specifications: Material: Sponge Color: Black Size (Approx.): 6.5x3x3cm/2.56x1.18x1.18in Weight: Approx.22g Package Includes: 4 Pieces Replacement Sponge Filter for Cat Water Fountain note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!