New 0.15mm/0.2mm 4" x 15" Aquarium Fish Tank Marine Sump Pre Filter Sock Bag Better Item You can buy high-quality goods at prices here. 100% brand new and high quality Filter socks are the best form of mechanical filtration. This is an essential part for wet/dry filter systems, sumps, and diy filters. Removes excess food, detritus, organic wastes, and other particulates to lower ammonia levels and other undesirable substances. Used as mechanical filtration for any sumps and diy filters Material: Polypropylene Size:105mm×380mm(approx) Micron rating for choose:150 micron (0.15mm) / 200 micron (0.2mm) Color:White Quantity: 1 pc Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: Aquarium Filter Socks x 1