Keep your musical instruments safe from extreme humidity with Boveda High-Absorbency 49% Two-Way Humidity Control Packs. These packs are designed to prevent warping and maintain the perfect moisture level between 45% and 55% RH in your instrument cases. Trusted by musicians for 25 years, Boveda ensures your wood instruments perform optimally by safeguarding their construction and sound quality. Simply place a pack in a fabric holder in your case and forget about it until it needs replacement, providing effortless humidity protection year-round.