HOW BOVEDA WORKS FOR WOODWIND REEDS: Boveda 72% RH protects reeds by stabilizing the humidity in a reed case. If the air inside a case is too moist, Boveda absorbs that moisture. If it's too dry, Boveda releases small amounts of water vapor into the case. Wide humidity fluctuations will cause the cane to expand or shrink. When stored with Boveda, your reeds will maintain their shape, so you'll get a more airtight seal with your mouthpiece for cleaner tone & better performance. | CHOOSE BOVEDA: Boveda's the only patented 2-way humidity control solution with more than 25 years of experience. Using saltwater in our humidity packs, we provide the fastest, most precise humidity control in the market for wood instruments and accessories. When you invest in an instrument, you want to ensure you take care of it to produce optimal sound. Boveda is the only humidity solution that can do so within 24-48 hours. | HOW TO USE: Remove the clear plastic overwrap before using. DO NOT cut or open the brown humidity packet. Slip the packet into a pocket or an open area in your reed case. (Reed case not included.) Close the lid. BOVEDA DOES THE REST. Replace every 60 days. Most musicians outfit 2 separate reeds cases with Boveda-one with a 72% RH Boveda pack for long-term storage & a second with an 84% RH pack (sold separately) for day-of performing. NEVER MIX the 72% with any other %RH in the same reed case. | WHO IS BOVEDA FOR: Boveda 72% RH is for players of clarinets, saxophones, oboes, bassoons, contrabassoons & English horns. Professional musicians, band & orchestra leaders, instrument techs, music teachers, hobbyists & student musicians use Boveda packs to keep single reeds & double reeds pliable, so they last longer. NO DAILY MAINTENANCE!