More Than 10 Types Aquarium Bio Balls Biochemical Ball Filter Media for Aquarium Filter Accessories for Fish Tank adding One Mesh Bag 100g 250g 500g
Features:

Practical and durable home using product.
BIO-Balls do not require replacement unless damaged or destroyed
The bio balls provide biological filtration, removing toxic ammonia and nitrite.
Can be reused over and over again until it breaks.
In the event of excessive buildup, you may gently rinse with water from an established aquarium, if desired.
Help to improve the water quality.

Speicificaitons:

Material: Plastic Aquarium Pond Balls

Color: multi colors

Weight: 100g/250g/500g bio balls+1 mesh bag (100g bio balls doesn't include mesh bag)

Including:
100g/250g/500g Aquarium Bio Balls+1 mesh bag