[High-efficiency Filtration] - This water filter elements set is a replacement for Gravity Filtration System filters. It has passed high-standard testing by authoritative institutions and efficiently reduces chlorine, fluoride, heavy metals, taste and odor, sediments, particles, and other harmful substances. Enjoy clean and healthy water anytime, especially in outdoor settings. [Black Filter] - The black filter is made from high-grade materials. Compared with ordinary granular activated carbon, it offers higher adsorption capacity and effectively reduces fluoride, chlorine, and various impurities. [Fluoride Filter] - The fluoride reduction filter elements help adsorb fluoride, vanadium (V), pre-oxidized iron (III), and other common heavy metal ions. [Perfect Compatibility] - This set of filter elements is compatible with Gravity Filtration System filters, including FOR Super Sterasyl, Traveler, Royal, Big, Imperial, and Crown Series. We recommend replacing the water filter every 1000 gallons and the black filter every 6000 gallons for optimal performance, or as needed based on your water quality. Material: Plastic Color: White + Black Package Contents: 2 x Water Filters 2 x Water Filters Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement may vary by 1-3 cm due to manual measurement.