Product Dimensions:20 x 20 x 5 cm; 62 Grams Size:56mm Quantity:1 Item Weight:62 g The biochemical ball is lightweight and easy to carry. It can be used not only in biochemical filtration systems in seawater, but also in biochemical filtration systems in freshwater. Perfect for using in fish tank, pond and aquarium. Specification: Item Type: Aquarium Filter Material Material: PVC + Sponge Color: Black Optional Type: 16mm, 26mm, 36mm, 46mm, 56mm, 76mm Quantity: 50Pcs Package Weight: Approx. 62-2410g Package List 50 * Biochemical Ball Delicate DesignBio sponge inside provides more surface area for growth of beneficial Bio spiral bacteria. Many flake structure, internal porous, great for any freshwater or saltwater. Safe Filter MediaGreat help to restore the natural water quality, and provide the most suitable living environment for your fishes. Large volume, strengthened the effect of filtering bacteria. Bio filter ballProvides a larger, muti faceted area for the growth of beneficial biological spirulina, which can naturally clean your water, is conducive to the oxidation of oxygen convection exchange, and is an important part of maintaining a clean and healthy aquatic environment. GuaranteeOur product give the strict assurance of the quality. If there is any quality problem with our products, you can choose replacement or full refund. Application Lightweight and easy to carry, perfect for using in fish tank, pond and aquarium. It can be used not only in biochemical filtration systems in seawater, but also in biochemical filtration systems in freshwater.unusual christmas gifts See more product details Delicate DesignBio sponge inside provides more surface area for growth of beneficial Bio spiral bacteria. Many flake structure, internal porous, great for any freshwater or saltwater. Safe Filter MediaGreat help to restore the natural water quality, and provide the most suitable living environment for your fishes. Large volume, strengthened the effect of filtering bacteria. Bio filter ballProvides a larger, muti faceted area for the growth of beneficial biological spirulina, which can naturally clean your water, is conducive to the oxidation of oxygen convection exchange, and is an important part of maintaining a clean and healthy aquatic environment. GuaranteeOur product give the strict assurance of the quality. If there is any quality problem with our products, you can choose replacement or full refund. Application Lightweight and easy to carry, perfect for using in fish tank, pond and aquarium. It can be used not only in biochemical filtration systems in seawater, but also in biochemical filtration systems in freshwater.unusual christmas gifts