[What You Get]You will receive 24 pcs filter cartridges compatible with RF-S Filter, measuring 8.1 x 1.9 inches, these small fish tank filters replacements blend seamlessly with your aquarium setup, not overpowering the beautiful aquatic environment inside. [Enhanced Design]Featuring a robust combination of cotton inhanced 4-Layer filtration, these cartridges deliver superior filtration. Effectively remove impurities, debris, and ex, ensuring a pristine and healthy aquatic environment while maintaining crystal-clear water clarity. [Easy to Install and Replace]No tools required! Only steps,first, remove used cartridge; Second, rinse new cartridge under cool water to remove dust. Thirdly, after rinsing, insert cartridge into filter chambe. Make sure cartridge fits completelly into filter chamber. [Long-lasting and Durable Product]Designed for longevity, our filter cartridges maintain peak efficiency for up to 4 weeks, providing consistent filtration without frequent replacements. [Sufficient Quantity And Great Value Package]You receive our products, the box packaging contains 24 pieces of quantity to choose from,our filter cartridges offer cost-effective aquarium maintenance, ensuring you always have a replacement on hand when needed.