Description: 8 Layers Of Filter Pad: 8D solid pad, high efficiency filtration. 8D is 2 layer mesh pad & honeycomb cotton & activated carbon pad & biochemical cotton & nano biochemical cotton & fiber biochemical cotton&cloud blanket filter contton Honeycomb Shape Design: The filter pad adopts a honeycomb shape design, which has strong water permeability and active carbon absorbs impurities. Function: with 8D filter element, it can easily traps different particles and floating debris, to avoid blockages and provide the largest adhesion area for bacteria Durable: The pond filter media is made of strong mesh cloth. Due to its dense structure, it will not be easily deformed no matter how many times it is washed Cut To Fit: Can be cut any sizes as your needed. Very suitable for using in freshwater and marine water Specification: Material: Nano biochemical cotton, fiber biochemical cotton, activated carbon mat Size Chart: Thickness: 2 cm/0.8 inch 50x11cm/19.69x4.33inch 30x40cm/11.81x15.75inch Package Includes: 1 Piece Fish Tank Filter Sponge Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!