1、Made from polyester, carbon, and iron exchange resin, can effectively remove hair, debris, dirt, and other particles in water. 2、The carbon has more pores and quicker absorbing speed, more durable than ordinary carbon. 3、Arc-shape design, measures 9.5 * 3 * 1.8cm/ 3.7 * 1.1 * 0.7inch, please check your water fountain size before order. 4、Please wash the filter before use, and change filters every 2-4 weeks, for the sake of pets\u0027 health. Features： Made from polyester, carbon, and iron exchange resin, can effectively remove hair, debris, dirt, and other particles in water. The carbon has more pores and quicker absorbing speed, more durable than ordinary carbon. Arc-shape design, measures 9.5 * 3 * 1.8cm/ 3.7 * 1.1 * 0.7inch, please check your water fountain size before order. Please wash the filter before use, and change filters every 2-4 weeks, for the sake of pets' health. Note: Blue/grey filter sponge shipped randomly Specifications： Color: Black and white Material: Cotton, carbon, resin Product Size: 9.5 * 3 * 1.8cm/ 3.7 * 1.1 * 0.7inch Product Weight: 4g/ 0.14oz (Single One) Note： The water fountain showed in the pictures is not included. Package List： 6 * Filter 6 * Filter