Lee's Bio Pin Balls are a filter media for wet/dry systems in freshwater and saltwater aquariums. This large size pack contains 74 balls, about 1 gallon of media, which you can link together or place loosely in the filter box.
Count: 74, large size
About 1 gallon of media
For freshwater and saltwater wet/dry systems
Connect them together or place them randomly in the filter box
Rinse the media in tank water before adding it to your filter.