Description: 100% brand new and high quality. Bio balls are filter media for freshwater and saltwater wet/dry systems. For efficient biological filtration. For use in fresh & saltwater aquarium and ponds. Help to clean water, turn the poison in fish tank into non-toxic matters. Specification: Material: Cotton Water Type: All Ball Diameter: 4cm/1.57inch Color: White Quantity: 20 Pcs Package Includes: 20 pieces Bacterial Balls (No retail package) Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you
