9-pack of replacement packets for the Planet Waves Humidipak Humidity Control System, the first maintenance free, two-way humidity control system that preserves a constant 45%-50% relative humidity level within your instrument's case. This all new, reformulated, patented "two-way" humidification system maintains 45-50% relative humidity which eliminates all maintenance and guesswork. this system is recommended by taylor guitars and others for maintaining the stability and playability of your instrument.

• 9 replacement packs for the Planet Waves Humidipak system
• Automatic humidity control protects your instrument against warping, cracks and other damage cause by lack of humidification
• No more manual adjustments based on seasonal changes, geographic locations, temperature, or other factors Unlike refillable humidifiers
• Eliminates the guesswork and anxiety of maintaining your instrument's proper humidity level