[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 chlorine, fluoride, and impurities.[Fluoride Filter] - The fluoride reduction filter elements help adsorb fluoride and reduce residual heavy metal ions such as vanadium (V) and pre-oxidized (III).[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 1,000 gallons and the black filter every 6,000 gallons for optimal performance, or adjust replacement frequency based on your water conditions.Material: Plastic Color: White + Black Package Contents: 2 x Water Filters 2 x Fluoride Reduction Filters Note: Light reflection and different display settings may cause slight variations in color between the product image and the actual item. Measurement error is allowed within +/- 1-3 cm.