Product Name : Bio Ball;Material : PlasticDiameter (Approx.
) : 18mm/ 0.
7"Color : BlackWeight : 75gPlastic bio ball filters are great for fish tank, to promote gas exchange and increase dissolved oxygen levels.
Great for tropical fish farms, koi ponds, waste water systems, cooling towers, and other commercial and industrial systems.
For use with wet/dry filters (here is not included), to improve biological filtration.
Package Content : 50 x Bio BallsNote:Light and different displays may cause the color of the item in the picture a little different from the real thing.
The measurement allowed error is +/- 1-3cm.