[3D Honeycomb Design for Excellent Mechanical Filtration] 3D woven filter socks using 3D textile technology and honeycomb sandwich structure are a disruptive upgrade in the filter bag industry. [4-Inch Aquarium Filter Sock Honeycomb Design] Mimics the way bees build a nest, is permeable and non-clogging compared to past aquarium felt filter bags, and is flexible enough to be flipped for easy cleaning. Create a Better Water EnvironmentThe pool socks feature interlocking micro-felt fibers that capture food debris, fish waste, rotting vegetation, dust and other floating particles, thereby improving the water quality inside the tank. Reliable Craftsmanship, Long-lasting ServiceThe 4-inch filter socks are made of high-quality polypropylene, tightly sewn, flexible and durable, and can be used and washed multiple times. Size: 25 cm long, 10 cm diameter [Three-dimensional weaving] Mimics bee nesting filter fabric socks with multi-functional sandwich filter..You'an store products.You'an store products