SOLO SG-07 Acoustic Guitar Humidifier Sound Hole Moisture Reservoir Guitar Humidity Sponge

Features:
Universal humidifier for acoustic guitars.
With a high-density sponge that releases moisture evenly and slowly.
Large water holding capacity, up to 7 days use after a refill depending on the climate.
The humidifier can be placed stably between 3 and 4 strings, never touch on guitar body.
Helps maintain the optimal humidity range of guitar storage(40%-60%).