Perfect MatchThe filter is compatible with the PETLIBRO 2.1L PLWF002 Fountain. Dimensions: The filter measures approximately 7 inches in length, approximately 3.6 inches in width, and approximately 0. 4 inches thick. Sponge measures 2.5 x 1.3 cm Packing: 12 Pack Replacement Pet Fountain Filters with Pre-Filter Sponge, individually wrapped and sealed to maintain high quality.< /p> Material: Each filter is made of activated carbon, ion exchange resin and non-woven fabric. They filter out hair, heavy metals and improve the taste of water, so pets can drink clean, fresh water all day. Recommendation: To prevent activated carbon dust (which will not harm your pets) from getting lost in water, soak the filter in water for 5 minutes before use, then rinse thoroughly under running water. Change the filter every 2-4 weeks depending on how often your pet drinks and the number of pets using the fountain. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store