Features:Great for fish tanks, to promote gas exchange and increase dissolved oxygen levels.
Great for tropical fish farms, koi ponds, waste water systems, etc.
For use with wet/dry filters (here is not included), to improve biological filtration.
Aiding in the critical gas-exchange process that is needed for successful biological filtration.
Specifications:Color: Black
Material: Environmental Plastic
Quantity: 100pcs
Dia: 18mm / 0.7in
Package Size: Approx. 21 * 14 * 2cm / 8.27 * 5.5 * 0.79in (L * W * H)
Package Weight: 152g / 5.35oz
Package List:100 * Bio Balls