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:10/20pcs(optional)
Dia: 56mm

Item weight: 35g/pc
Package Size:

Package Weight: 360g (10pcs); 720g(20pcs)

Package List:

10/20 * 56mm Bio Balls