product description1.Odor absorber These bamboo charcoal bags are a safe and natural odour absorber which , formaldehyde, moisture, smoke, pet smells and moisture from the surrounding environment to keep your space fresh and clean.2.Natural Made of bamboo activated charcoal which is a fast-growing sustainable material with a highly porous structure and excellent adsorption properties. Packed in biodegradable sacks makes them very safe to use. It is reusable and durable enough with proper care3.Easy to UseThese natural charcoal odor eliminators are very easy to use and hang with the metal buckle and buckle loop design plus included hooks. Put them all over the in curtain rods, near the litter box, on clothes racks, or in the back storage room .4.Wide ApplicationCarbon activated bamboo charcoal purifying bags are perfect for multiple places such as the car, kitchen, bathroom, toilet, fridge, shoes, gym bag, rubbish bin, pet areas, or most where with damp, stale or smoke smells that needs air purifying purpose.5.Valuable PackThe package comes with 4 packs of 200g bamboo charcoal bags. You put them in the sun for an hour to activate them and they work for a month. Do the same to "recharge" them after used over and again and youll have them work for long years.