Guitar Humidifier Kits Replacement Kits Maintenance Kits Style A Description: [HUMIDIFICATION SYSTEM]: This is the only maintenance, two-way humidity control system for the guitar. Includes pouches and sets of guitar humidifiers. [Protect Your Guitar]: Protects your instrument from warping, cracks, and other damage caused by lack of hydration. [TWO-SIDED HUMIDITY CONTROL]: The first two-way humidity control that maintains a constant relative humidity level of 45%50% in the instrument housing [AUTOMATIC HUMIDIFIER]: Automatically maintains an optimal relative humidity level of 45%50% in the instrument housing, eliminating the guesswork and potential mess associated with refilling the humidifier. [AUTOMATIC ADJUSTMENTS]: No more manual adjustments based on seasonal changes, geographical locations, temperature or other reusable humidifier factors. Specification: Material: nonwoven fabric Size Chart: A: 12 cm x 9,5 cm/4,72 inch x 3,74 inch B: 12 cm x 7,5 cm / 4,72 inch x 2,95 inch The package includes: Optional package 3 sets of guitar humidifiers 1 canvas bag Or 3 Packs Guitar Humidifiers