The ReefH2O 4"x10" 200 Micron Filter Sock is a must-have for any marine aquarium enthusiast. This filter sock effectively removes debris, waste, and particles from the water, resulting in a cleaner and healthier environment for your aquatic pets. The sock measures 4"x 10" and has a micron rating of 200, making it an ideal choice for capturing large particles. This product is sold in bulk without packaging, making it a cost-effective option for those who need multiple-filter socks. Trust ReefH2O for superior quality and reliability in all your aquarium needs.