Description: Fine mesh, great water permeability. Durable, washable, and reusable. For Pellet Carbon, Bio Balls, Ceramic Rings, Ammonia Remover. Suitable for both fresh water and sea water. Five pieces fine mesh zipper bags in one pack. Specification: Material: Nylon Size 1(LxW): Approx. 30x25cm / 11.81x9.84inch Size 2(LxW): Approx. 33x25cm / 12.99x9.84inch Size 3(LxW): Approx. 25x20cm / 9.84x7.87inch Size 4(LxW): Approx. 44x32.5cm / 17.32x12.80inch Package Includes: 5 Pieces Aquarium Mesh Media Filter Bag Note: 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.