Check the listing for details. VIVOSUN 4"/6"/8" PP Cotton Prefilter for 4/6/8 inch Carbon Filter Black/White. Color: White/Black, Condition: New. Listed at 8.99 USD. VIVOSUN Black / White Pre-filter for 4"/6"/8" Carbon Filter VIVOSUN’s carbon filter uses activated charcoal, and each carbon molecule is magnetically charged to attract passing molecules, whether they be smelliness or other impurities. The pre-filters wrapped outside the filters protect carbon filters from hair, dust, and other debris, increasing the service life of filters. Cotton Made in USA or Imported Durable: Made of high-quality PP cotton, it is durable and can withstand multiple cleanings without deformation and can be used repeatedly Reliable Protection: 1.8 mm thickness protects the charcoal bed from hair, dust, lint, pollen and other large particles Good Filtration: Breathable material allows unobstructed passage of air for proper air filtration and odor control，ensuring optimum air quality Perfect Fit: Exclusive for carbon filter and it can extend carbon filter lifespan; Available in a variety of sizes to meet the needs of different sizes of carbon filters Easy to Install: The sleeve is made according to the shape of the carbon filter, means that you won't need any extra tools to install or remove it