Features:
Material: the high-qaulity plastic is non-toxic and harmless for fish and will not decay to pullote the water.
Bio ball that is made of clear plastic is hollow sphere. It has large surface and can attach large sums of nitrifying bacteria. 
Thread structure, easy for installation and removal, great for DIY. 
Can use as grass cultivation platform or filling filter for water purification. 
Ball: the surface is large enough and can attach large sums of nitrifying bacteria.
Filter: it can remove all the filter material and keep the aquarium environment clean.
Application: it is suitable for fish tank, aquarium and so on, especially shrimp tank. You can put the moss ball into the botton of the aquarium, which is easy and does not need efforts, and you can use ston or wood with fishing line to prevent it from floating.
Decorative: the vividly and cute shape design can add fun and activity to the life of your fish tank and make it different.
 
Specifics:
Material: Plastic 
 
Color: as show
Quantity: 1pc 
Size:
Diameter: approx. 5cm/1.96\'\' 
Height: approx. 3.6cm/1.42\'\'