How does Boveda protect wooden instruments?

Music industry experts recommend that wooden instruments be stored between 40 and 60% relative humidity (RH). The Boveda patented 2-way humidity control system automatically maintains 40 to 60% RH inside of your instrument case. This stable humidity level helps prevent damage, like cracking, warping, and  swelling, caused by humidity fluctuations. Because Boveda is zero-maintenance humidity control, your instrument will always be protected.