Having been in the industry more than 25 years, Boveda is a trusted and experienced brand in relative humidity control. But what does that even mean? Relative humidity (RH) refers to the percentage of humidity within an environment. In other words, it answers the question, 'how moist or dry is the air?' Boveda's founders and scientists discovered that the right RH has a huge impact on a items's aroma, flavor and potency. Using Boveda, you’ll maintain a precise moisture level, which keeps your natural items fresh. No more mustiness. You can even use a Boveda pack to revive dry items. It takes just seconds to protect your items with Boveda. Just slip a Boveda in, close the container, and forget about the pack until it starts to get hard. Once it does, just switch it out with a replacement pack. (Boveda 62 RH Size 8 come in a pack of 10.) Each pack can last you up to 6 months. Its lifespan depends on how often you open the container ; ), how airtight your container is and how dry or humid the climate you live in is. Subscribe & Save to get Boveda replacement packs sent to you automatically. Proudly Made in the U.S.A. to Keep IT Fresh.