Aquarium equipment -Bio-Ball Auqarium Fish tank ball balls Highlights generic brand Bio-Ball Auqarium Fish tank ball balls Description: Bio Balls are filter media for freshwater and water systems salt wet / dry For effective biological filtration. For use in fresh and salt water aquariums and ponds. You can gently rinse with aquarium water if there is excessive buildup. Material: PVC Plastic, Color: Blue, Diameter: Approx. 1.5cm/0.59inch, Height: approx. 1.6cm / 0.63 inch. Specification: Material: PVC+Biochemical Cotton Package Include: 300 Pieces Bio Balls Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.