SG-07 Acoustic Guitar Sound Humidifier Hole Moisture Tank Guitar Moisture Sponge Guitar Accessories PartsFeature:1. Large water absorption capacity, about 8 times the weight of a sponge.2. A special anti-mildew sponge can effectively prevent the growth of mildew.3. Balanced humidification, 30 vents, all-round humidification.4. Special card string design that won't hurt your strings without over-distributing the strings. Specification: Material: Eco-friendly ABS + SpongeColor: Black, Yellow, PurpleSize: 40*40*113mm/1.57*1.57*4.5inNet Weight: 35g Tips: The recommended relative humidity range for guitar storage environment is 40%-60%. If conditions permit, use an ambient humidity hygrometer to store your guitar. When the humidity is lower than 40%, the humidity is too low, please use this product for humidification; When the humidity is higher than 60%, it is recommended that you do not use this product. Note:Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures. Please allow 1-2cm measurement deviation due to manual measurement. 1 X Guitar Humidifier