5 bags of Passive Activated Carbon Air Filter/Air Fresheners. Black non-woven fabric cubes. * Each bag contains 250 grams of bamboo charcoal granules. Measures approximately 7" x 7" x 1.5" * Bamboo Charcoal helps improve indoor air quality by absorbing and trapping odors, allergens, and harmful VOCs. * Re-usable for years, just place 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.