Boveda Large 49% Moisture Pack

Using High-Absorbency Boveda in an instrument case:

Protects wood instruments in year-round extreme humidity level of 50+% (Lower humidity? Choose Boveda 49% RH for wood instruments.)
Prevents warping and mildew build-up
Keeps wood instruments in the humidity safe zone by automatically maintaining constant relative humidity (RH) level between 45% and 55%.
Curbs humidity fluctuations that throw off an instrument's measured alignment and cause permanent damage (Think going in and out of air-conditioned venues, traveling by air, performing in outdoor venues, etc.)