each natural air purifier bag contains activated Bamboo Charcoal from sustainable bamboo processed with high temperature oxygen-free carbonization. These bamboo bags are the for and odor removal. For Years - Each of the four Bamboo Charcoal air purification bags in the room weighs about 200g. Place the Bamboo Charcoal air freshener in the sunlight for at least once a month for 2 hours to the Bamboo Charcoal block's filtration capabilities and enjoy the best performance in few years! 4 Pack for Every Place - The Bamboo Charcoal particles have a larger specific area, which means our activated Bamboo Charcoal air purifiers bags have a stronger adsorption cleaning capacity. Our Bamboo Charcoal bags are designed for home, commercial, and travel use. Ideal to use in bedroom, closet, fridge, freezer, kitchen, basement, car, etc. Eco-friendly & Long Lasting - Natural organic and chemical free odor absorbing bags have an anion charge and a porous structure. With that deodorizer bags odors instead of covering odor. These new household Bamboo Charcoal bags are packed in burlap bags with a reinforced metal hole for easy hanging. They're reusable, and with proper care, they'll last around two years which saves you time and money! Material: activated carbon Color: as shown Package Contents: 4 Pcs Bamboo Charcoal Bags Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.