About Yumybom Bamboo Charcoal The Yumybom Air Purifying Bags contain only high-quality bamboo charcoal made from bamboo. Fresh bamboo plants are treated at 800C to 1000 C in a brick kiln for several weeks to form charcoals with millions of porous microstructures that absorbs odor-causing sweat without the harmful effects of chemicals or fragrance.The Yumybom Air Purifying Bags contain only high-quality bamboo charcoal made from bamboo. Fresh bamboo plants are treated at 800C to 1000 C in a brick kiln for several weeks to form charcoals with millions of porous microstructures that absorbs odor-causing sweat without the harmful effects of chemicals or fragrance. Reused up to 2years Recharge your bag every month by placing it in direct sunlight for a couple of hours. After two years of use, recycle the Yumybom charcoal bag in your garden where it will decompose naturally. What do you get 4 pack of Bamboo Charcoal bag Each bag size:6.5 inches * 3 inches, 2.6 oz