Features:

Increase oxygen levels, lower CO2 and raise PH, creates water currents
It is an important instrument to successfully keep aquatic fish for respiration process.
Durable, can be reused and washed repeatedly.
Strong Suction Cup.
Rotary design to control the bubbles.
Creates bubbles in fish tank while attached to an air pump(air pump and air tube is not included).

Specifications:

Color: Black (white pad)

Material: plastic (cotton pad)

Item Size: Approx. 3.5x6.5cm
Dia. of replace cotton: about 3.2cm

Air Tube: Inner dia. 4mm.; Outer dia. 6mm

Package include:

1pcs /2pcs Aquarium Air Bubble Stone

Note:

-Soak in water for 15 minutes before use.

-For long-term use, if there is dirt blockage, and the bubbles is reduced, please take it out of the fish tank and wash it again and again.

-The air stone can be used repeatedly.

-Please allow 1cm differs due to manual measurement.

-Due to the different display and different light, the picture maybe a little different with the actual color of the item. Thanks for your understanding.