4Pack Acoustic Instrument Humidifiers Keep wooden instruments stable and reduce the risk of cracking and warping by maintaining consistent humidity inside the instrument body and case. This 4piece set is designed for everyday use with a range of acoustic instruments. Key benefits Maintains humidity for wooden instruments to reduce cracking and deformation during dry conditions. Simple, noninvasive design that sits inside the instrument or case without affecting playability. Four humidifiers provide coverage for multiple instruments or spare units for travel and storage. Easy to use and maintain for both beginners and experienced players. What it does Gradually releases moisture to help keep the internal environment more stable. Helps protect tops, necks, and bridges from stress caused by fluctuating humidity levels. Designed for regular use during dry seasons, when heating is on, or while transporting instruments. Compatibility and fit Compatible with acoustic guitars, ukuleles, violins, mandolins and other similar hollowbody string instruments. Compact, lowprofile design suitable for most soundhole and case applications. Practical attributes Fourpiece pack for multiple instruments or backup use. Lightweight and unobtrusive so it does not interfere with playing or storage. Refillable and reusable format for routine humidity management. Use scenarios Home storage during winter: Place a humidifier in the instrument or case to reduce cracking risk when indoor air becomes dry from heating systems. Travel and gigs: Keep a humidifier in the case while transporting an instrument to help limit sudden humidity changes between locations. Longterm preservation: Use in instruments that are stored for extended periods to maintain more consistent internal humidity and reduce stress on wooden components. What you get A set of four humidifier tools designed for acoustic instruments, intended to be placed inside the instrument body or case as needed. This product supports routine humidity management to help protect wooden instruments from damage caused by dry conditions.