Sumind 5 Pack Aquarium Filter Bags, Mesh Fish Tank Media Bag for Bio Balls, Pelletized Carbon, Ammonia Remover and Ceramic Rings, Black

Durable for use: Nylon mesh bag with metal zipper on the top, washable and reusable, can serve a long time. Small mesh hole: Holes diameter: 2 mm/ 0.08 inch. Media that smaller than 2 mm will escape ..