BambooMN Brand - Granulated Bamboo Charcoal Odor Absorber in Decorative 4" Box, Brown 2pc 2 pack of Passive Activated Carbon Air Filter/Air Fresheners, each in decorative 4.25" X 4.5" X 4" box Each attractive bamboo box contains 300 grams of bamboo charcoal granules in a non-woven filter bag. Bamboo Charcoal helps improve indoor air quality by absorbing and trapping odors, allergens, and harmful VOCs. Re-usable for years, just place inner bags in bright sunlight for a couple hours twice a month to renew odor absorbing capability of the charcoal. The activated carbon in these air fresheners is derived from environmentally friendly bamboo.