Love Your Instrument—for effortless humidity protection, use Boveda. Having been in the industry for 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 in my instrument case?' Boveda's founders & scientists discovered that the right RH has a huge impact on a wood instrument's performance & sound & safeguarding its construction. Using Boveda, you'll maintain a precise moisture level between 45 and 55% RH—no more mustiness in your instrument case. USE BOVEDA HIGH-ABSORBENCY HUMIDIFIER/DEHUMIDIFIER PACKS FOR A WOOD INSTRUMENT EXPOSED TO HIGH HUMIDITY YEAR-ROUND. Just slip a Boveda into a Fabric Holder (available separately), position it in your case & forget about the pack until it expands. Once it does, just switch it out with a replacement pack. (Unlike Boveda 49% RH humidity packs, HIGH-ABSORBENCY BOVEDA PACKS DO NOT GET HARD OR CRUNCHY WHEN YOU NEED TO REPLACE THEM.) Each Boveda High-Absorbency 49 pack will last 1 to 6 months. Its lifespan depends on how often you open your case, how airtight your case is, & how dry or humid the climate you live in is. Maintain the right humidity in a musical instrument case for: GUITARS, including acoustic, electric, electric bass, guitarrón, hollow-body, nylon string & semi-hollow body; FRETTED INSTRUMENTS, including banjo, mandolin & ukulele; STRINGS, including cello/violoncello, double bass/upright bass, hollow-body bass, viola & violin; & WOODWINDS, including bass clarinet, bassoon, clarinet & oboe. Subscribe & Save to get Boveda replacement packs sent to you automatically. Proudly Made in the U.S.A.