The Fluval 306/406 fine filter cartridge is a high-quality filtration solution specifically designed for use in aquarium internal filters. These cartridges are compatible with the Fluval models 304, 305, 306, 404, 405, and 406, providing effective filtration for freshwater environments. Made from durable fleece material, they ensure reliable removal of dirt and impurities from the water, contributing to a clear and healthy habitat for aquarium inhabitants. With dimensions of 190 mm in height, 120 mm in width, and 115 mm in length, these filter cartridges are easy to handle and install. The package includes six pieces, allowing for long-term use and maintenance of the filtration system. Using these fine filter cartridges helps maintain water quality and promotes a stable ecosystem in the aquarium.