["Acoustic Guitar Humidifier Sound Hole Moisture Reservoir Guitar Humidity Sponge Guitar Accessories\n\nFeatures:\nbrand new and high quality.\n- Universal humidifier for acoustic guitars.\n- With a high-density sponge that releases moisture evenly and slowly.\n- Large water holding capacity, up to 7 days use after a refill depending on the climate.\n- The humidifier can be placed stably between 3 and 4 strings, never for touch on guitar body.\n- Helps maintain the optimal humidity range of guitar storage (40%-60%).\n\nSpecifications:\nColor: black, yellow, purple\nMaterial: plastic + sponge\nItem Size: 11.3 * 4 * 4cm/ 4.4 * 1.6 * 1.6in\nThe guitar showed in the picture is not included.\n\nNote:\nTransition: 1cm=10mm=0.39inch\nPlease allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage Includes:\n1 × Guitar Humidifier"]