Product Description Boveda provides 2-way Humidity control for your medicine. Perfect for any air-tight storage containers or jars. Every Boveda RH is accurate to +/- 1% in an air tight environment. It's common that the actual RH of your humidor/container will stabilize up to 5 points lower than the Boveda RH you're using, due to container quality and ambient dryness. That's why we offer Boveda in two different RH levels- 58% and 62%. So you can use the RH that achieves the humidity you and your extracts prefer.  Features Made in USA Never guess if or when to refill your humidifier again Cycles in humidity are eliminated No more hassle of using distilled water No need to activate, maintenance free