Honritone 2 Pack Mesh 4 Inch Filter Socks 150 Micron 4" Plastic Ring, 9" Short Bag Nylon Bags Filteration for Aquarium Marine Reef Sump

4 Inch Diameter Plastic Ring,9 Inch Short Long Bag. Filter socks are made of high qulity NYLON, Excellent for mechanical filtration. Micron rating: Available in 150 micron (0.15mm),150 micron mesh filter socks is smaller than 200 micron,which trap large to fine debris floating in the water to keep aquarium water crystal clear. Solid construction and heavy duty stitching make these socks strong and durable so these mesh socks can be cleaned and resued many times. Quantity: Available in Pack of 2 .