Package Content: You will receive 12 pieces cat fountain filters with triple filtration system. Sufficient amount is enough to meet your use and replacement need, providing clean drinking water to your pets. Product Size: The cat water filter sponge measures 11.4x5.7x1.9cm/4.5x2.24x0.75inch, compatible with 50oz/1.5L WF-050 and WF-100 clear pet fountain. Please confirm the size before buying. Premium Material: The pet fountain sponge filters are made of high density sponge, activated carbon and ion exchange resin, soft and reliable material, offering better water purification effect for your pet. Filtration Function: With high density and high-content activated carbon, this pet fountain filters can effectively filter hair, dust, heavy metals and other impurities. Keep your pet's water clean and fresh. Warm Tips: Please rinse the cat fountain filter sponge with water flow before use, soak the foam filter for 5 minutes and it is better to replace the sponge filter every half a month in summer and every three weeks in winter. Product Benefits: Removes Impurities Colour:Black & White Material:sponge Package Contents: 12 * Filter Only the above package content, other products are not included. Note: Light reflection 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.