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The Aquascape BioBalls is a textured surface ball made for beneficial bacteria to grow on. 19 square inched per BioBall. Aquascape BioBalls are the perfect filtration media to use with all biological filtration. Each box contains 100 BioBalls and the box size is 8' x 8" x 6.5" and filled to capacity in the box. Will not break like pegged BioBalls.