Oxygen air stone

Diffuser oxygen in three sizes.
The air stone is important for fish oxygen.
Soak the stone in water for fifteen minutes before use.
Clean regularly by a brush as they get clogged after months of usage.

Specifications
Size
Small Diameter 8cm and 3.1″
Medium  Diameter 10cm and 3.9″
Large  Diameter 12cm and 4.7″

Notes:
The real product colors may be slightly different from what you see in the images.
The product dimensions may be slightly different from what is written in the product specifications.