7" Flange x 16" Long, 5 Pack, Perfect for Aquariums, Made in USA High quality construction and heavy-duty stitching make these filter socks strong and durable. Long lasting and reusable, can be rinsed and reused multiple times saving you money. Fine density removes fine particles leaving your aquarium water crystal clear. Safe for all aquatic life, do not contain any harmful contaminants. The Filter Pro 200 Micron Filter Sock is a high quality and reusable filter sock. These filter socks are easy to install and are great for any sump filtration system and wet/dry aquarium filters. These provide fine mechanical and biological filtration. Traps and removes free-floating debris, uneaten food and ammonia-producing organic matter for crystal clear aquarium water. This means healthy water conditions, and healthy aquatic plants and animals! These felt filter socks also keep larger objects from entering the pump chamber, helping to prevent costly pump damage. Also reduces maintenance on filters that would otherwise become clogged. These socks are extremely durable and are also reusable. They can easily be rinsed out and reused. Made in USA