The BOVEDA 72% RH 2-BOX SIZE 8 helps you store reeds and make them last longer. Prevent damage by protecting reeds in a reed case with Boveda. Your reeds will maintain their shape, so you'll get a more airtight seal with your mouthpiece for cleaner tone and better performance. 72% RH is for: Worry-free reed storage when you’re not playing your instrument; Single reeds and double reeds for clarinets, saxophones, oboes, bassoons, contrabassoons and English horns; Automatically balancing moisture in a reed case—nothing more to add, nothing to rewet and no humidity fluctuations; Maintaining a consistent moisture in a reed case to prevent reeds from splitting, cracking and warping; Inhibiting mold growth Includes One (1) reed case—one pack to use now plus a replacement. For use in a non-airtight reed case or reed container (not included) Our patented two-way humidity controlled Boveda packs compensate the atmosphere inside your humidor. When water vapor is needed, Boveda releases the cleanest and most purified humidity. When there is too much moisture in your humidor, Boveda absorbs the excess. With Boveda, you do not have to adjust any valves or figure out if you put in too much or too little water and you will never have to fill or refill your device with water again - ever. EFFORTLESS PROTECTION: Nearly all guitars and other musical instruments made from wood are built in an environment where humidity is closely controlled and monitored. Wood is susceptible to warping that can alter the tone and timbre of the instrument, or even worse, cause it to crack during the manufacturing process. Protect your instruments against warping, cracks, and other damage cause by lack of humidification. IDEAL HUMIDITY FOR WOODEN INSTRUMENTS: Most experts and instrument manufacturers agree that an ideal relative humidity range of 45-50% is best for storing instruments. Stop risking your instrument by adding water or other solutions. 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 you protect your sound with the right relative humidity control with any wooden instrument! Boveda devoted the past 23 years to the science of two-way humidity control, we know you will benefit from our commitment to precision. Becoming the global leader in any category does not happen overnight, but Boveda did this and continues to do so since 1997. Today, that persistence looks like millions of two-way humidity control packets getting shipped out each year to protect your finest cigars and tobacco related products. Uses only pure water and all-natural salts sealed inside a leakproof membrane. Unopened, Boveda can stay fresh for up to 2 years in its overwrap and sealed bags.