Description: With fast filtration speed, reusable and washable filter balls, good flexibility and low loss, the filter balls can support long-term use with proper maintenance. Featuring good cleaning and adsorption capacity, this pool filter ball can filter suspended solids and impurities in the water very well, which can help you to improve the quality of water and make you have a good swimming experience. It is constructed of fiber material. This single filter ball is 50mm in diameter. It is suitable to filter water in swimming pool or aquarium fish tanks. Item Name: Pool Filter Ball Material: Fiber Features: Effective, Reusable, Machine Washable, Strong Filtration Size Details: Single Diameter: 5cm/1.97" (Approx.) Notes: 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. Package Includes: 1 Bag of Pool Filter Ball