Item Type: Aquarium Filter Media Ceramic Bio Balls Material: Ceramic, Quartz Ball 1,REUSABLE: Aquarium filter media uses bio ceramic rings and quartz balls, which are biologically active and can be washed and reused many times. 2,WATER PURIFICATION: Aquarium filter media ceramic bio balls purify fish tank water, effectively reduce water pollution and remove impurities. 3,BIO FILTRATION MEDIA: Fish tank filter media bio balls are used as biological filtration media, which can easily create a good living environment for fish. 4,LIGHTWEIGHT AND TOUGH: Aquarium filter media bio balls are light in weight but tough enough to retain their shape and will not degrade or wear out. 5,RANGE OF APPLICATION: Fish tank filter media ceramic bio balls are suitable for several types and sizes of fish tanks and aquariums.10 x Aquarium Filter Media Ceramic Bio Balls 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.