Naturally activated charcoal helps absorb odors caused by mold, mildew and other pollutants. Use for long term storage of boats, Rvs and cabins. Works great in refrigerators, crawl spaces, closets, basements and other locations. Helps control pet odors, kitchen smells, musty odor, tobacco and much more. Each individually wrapped X-Odor Eliminator lasts up to four months.