20 pcs. Aquarium Filter Bag 100um Felt Aquarium Bag Description: A bag for socks with a thickness of 100 micrometers. The bags provide excellent mechanical filtration, which helps to reduce the amount of ammonia-producing material in the aquarium by stopping contaminants, which also helps to prevent damage to aquarium equipment by large and small objects such as sand and coral. The sturdy construction and durable stitching make these socks strong and durable, so you can clean and reuse them multiple times Aquarium filter bag can effectively improve the water quality of aquarium, can improve uneaten food, waste excreted by livestock, rotting plants, detritus, dust and other floating particles. or have a healthy and clean living environment Suitable for aquarium, aquarium, chemical industry, etc Specification: Material: polypropylene fiber Length: approx. 230mm/9.06 inch Inner diameter: approx. 90mm/3.54 inch Outside diameter: approx. 105 mm/4,13 inch Colour white The package includes: 20-piece filter bag for aquarium (100um) Note: Since the above size is measured manually, the actual size of the item may be slightly different from the above size. Due for lighting effects, monitor settings, etc. Could be a little Slight difference in photo color tone and actual position