The Top Fin EF-S Element Filter Cartridges are designed to keep your fish tank clean and healthy. With 6 sealed cartridges included, these filter cartridges effectively remove heavy metals, odors, pigments, and organic waste from your aquarium water. Made by the trusted brand Top Fin, these cartridges are specifically designed for external filtration and are suitable for fresh water tanks. Manufactured in Vietnam, these cartridges offer a convenient and efficient way to maintain the quality of your aquarium environment.