General description 8 Packs Filter Socks are designed for effective mechanical filtration in aquariums, saltwater tanks, and ponds. These high-quality, professional-grade filter socks improve water quality by trapping debris, detritus, excess food, sand, and coral, ensuring crystal clear water. The 200 micrometer felt material captures smaller organic matter that larger or mesh filter socks may miss, while also reducing noise and splashing in your overflow system. Technical specifications Material: PP polypropylene Diameter: 105 mm Total length: 380 mm Micron rating: 200 micrometers Package Contents 8 x Aquarium Filter Socks Other information Note: Light shooting and different displays may cause the color of the item in the picture to differ slightly from the real thing. The measurement allowed error is +/- 1-3 cm.