PERFECT MATCH: Our cat water fountain filters for 67oz/2L stainless steel cat water fountain. HEALTHY FILTER MATERIAL: The pet fountain filters is composed of high-quality activated carbon and ion exchange resin to form a three-layer filtration system, they can filter hair and residue, absorb odors, soften water and achieve good purification performance. FRIENDLY RECOMMENDATIONS: Rinse the cat carbon filter with water thoroughly before use, then install the cat fountain filter into the cat drinking water fountain. (Note: Change a cat fountain filter after using 2 to 4 weeks to keep water running fresh and clean.) Filter elements size: 7.6x4.3cm Filter sponge: outer diameter 7.6cm, inner diameter 5.7cm Material:Non-woven fabric, sponge colour:White+Black Package Contents: 4 * cat fountain filters 4 * round black filter sponges Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.