Without proper humidity control, wood instruments will not perform at their maximum ability and even worse can be damaged. To maintain their shape, wooden instruments need to be stored at a stable 40–60% RH (relative humidity). Wide fluctuations in humidity will cause the wood to expand or shrink, which puts stress on the instrument and degrades its performance abilities. Stop risking your instrument by adding water. Only Boveda’s patented 2-way humidity control adds or removes moisture as conditions require to maintain the ideal humidity level in your instrument case. Boveda helps prevent warping or cracking, and eliminates downtime for service. Because Boveda requires zero maintenance, your instrument will always be protected. Using Boveda to balance humidity in an instrument case: Requires zero maintenance—no more filling messy hoses and snakes and wetting sponges Maintains an ideal relative humidity range for instruments—40-60% RH Prevents wide fluctuations in humidity that cause the wood to expand or shrink, and degrade its performance abilities Replace your Boveda every (three) 3 months. Just slip these refills into the Boveda Leakproof Holder(s) and slide them back into your instrument case.