Description This Fish Tank Filter Ball is a simple and practical fish tank filter tool, which is very suitable for fish tank or aquarium use, and very suitable for the water quality purification in the fish tank. Therefore, an gift choice for your friends who want to farm some pet fishes. The flow of water droplets through the biosphere is greatly lengthened, increasing the action time of nitrifying bacteria and cleaner water 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 exquisite craftsmanship guarantees a good cleaning effect.-It is characterized by its simple structure and convenient use, which can save your time and energy.-It can quickly remove harmful substances, peculiar smells, purify and soften water and pigments.-Good material and low price, you can buy this product at a reasonable price.The unique design and exquisite craftsmanship ensure its popularity and practicality.-The internal biochemical cotton further improves the filtration effect and stabilizes the water quality, accelerating the maturation of nitrifying bacteria.Package list: 100 x Aquarium Filter Balls