Ever Bamboo Guitar Dehumidifier Bag Set w/ Bamboo Charcoal (3-50 g) ALL NATURAL DEHUMIDIFIER - Bamboo charcoal is a naturally occurring porous structure with millions of microscopic holes pulling and absorbing odour and moisture from the air. Absorb excess moisture from your wooden instrument with sustainable, reusable, and recyclable bamboo charcoal. PROTECTS INSTRUMENTS FROM HUMIDITY - Protect not only your guitar, but any wooden instrument. A gloss finish might protect the instrument from impact or liquids, but it is NOT a vapor barrier. It is critical to stay in tune with the needs of your instruments and protect them from the damaging and irreversible effects of humidity and moisture. INSTRUCTIONS - When storing guitar in case, simply place 2 pouches by the body of guitar, and 1 pouch by the neck. Keep in mind, an instrument that has seen extreme levels of humidity for an extended period of time will require several weeks of consistent restore its proper humidity level. LASTS UP TO 1 YEAR - Reactivate your bamboo charcoal under sunlight 2-3 hours per side every 30-60 days.