This Fish Tank Filter Ball is a simple and practical fish tank filter tool, which is fish tank or aquarium use, and the quality in the fish tank. Therefore, an present choice for your friends who want to farm some pet . The flow of droplets through the biosphere is greatly lengthened, increasing the action time of nitrifying and cleaner quality. Features -Color:Black -Material:PVC, Cotton - Size: 2.60X2.60X2.60cm/1.02X1.02X1.02in -Aquarium Filter Ball is made of excellent materials, and the craftsmanship a good cleaning effect. -It is characterized by its simple structure and convenient use, which your time and energy. -It can quickly remove harmful substances, peculiar smells, purify and soften and pigments. -Good material and , you can . The unique design and craftsmanship popularity and practicality. -The internal biochemical cotton further improves the filtration effect and stabilizes the quality, accelerating the maturation of nitrifying . Package list: Aquarium Filter Balls