ITEM NAME:Aquarium Porous Ceramic filter media Net Bag- Biological ball fish tank 10PC 3C Aquarium Porous Ceramic filter media Net Bag- Biological ball fish tank 10PC 3C a.imagelink a:hover.imagelink {color:#5a5959;.Bio ceramic ball Specifics This is Breathing Bio Ball made by nano technology. The Bio Ball were Fired by high temperature. Color: Yellow.