Description: 100% Brand New, High Quality. Thread structure, easy for installation and removal, great for DIY. Can use as grass cultivation platform or filling filter for water purification. Bio ball that is made of plastic is hollow sphere. It has large surface and can attach large sums of nitrifying bacteria. Moss Balls are an excellent addition to your community fish tank because they suck up CO2 and release much needed oxygen into your aquarium water. Specification: Material: Plastic Color: Black Diameter: Approx. 8 cm/3.15 inch Package Includes: 5 Pieces Moss Balls(Moss or Grass not included) Note: Since the size above is measured by hand, the size of the actual item could be slightly different from the size above. Due to the lighting effects, monitor settings, etc. There could be some slight difference in the color tone of the pictures and the actual item
