Optimal Filtration: Provide the optimal environment for your with our premium bio balls. They're designed for efficient water purification, promoting the growth of beneficial and keeping your water clear and healthy. Compatible: The 500g size of our bio balls is suitable for aquariums of all sizes, making them ideal for both small and large aquarium systems. and Reliable: Made from high-quality materials, our bio balls are and built to withstand constant use in your aquarium filtration system, providing a long-lasting solution for your filtration needs. Easy to Use: Simply drop them into your aquarium filter and they're ready to go. They're easy to clean and maintain, ensuring worry-free use. Hot Seller: Don't miss out on our currently popular bio balls. They're perfect for both amateur and professional aquarists. Color: As shown Material: Filter Material Package Contents: 1 set*500g Aquarium Bio Balls Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.