Boveda 49-Percent RH Two-Way Humidity Control for Guitars and Wood Instruments - Starter Kit[Product Information]- Starter Kit includes 4 large 70 gram Boveda packs and 2 leak-resistant fabric holders.
- Boveda technology is unlike all other 1-way humidifiers， it's the only true 2-way humidity control that will add or remove moisture as needed to maintain between 45-55% relative humidity in your guitar case.
- Protects your wooden instrument against warping， cracks and other damage caused by lack of humidification or too much humidification.
- Typically lasts between 2-5 months in a seasoned case. Longevity depends on time of year， case quality and ambient RH levels.
- Boveda pack dimensions: 5.25" x 3.5". 2+ year shelf life before opening.
