Universal Guitar Humidifier Sound Hole Humidifier Hygrometer for Folk Guitar Acoustic Instrument Care AccessoriesWith indicator needle, accurate and durable. The high-quality sponge ensures even moisturizing. Porous diffuse design, balanced humidification, ultra-long humidification cycle. Flexible plastic for guitar protects your guitar from damage. Protect your guitar 24 hours a day, maintain proper humidity, and avoid dry, cracked, wet and moldy guitars. Applicable to folk guitar, classical guitar and all acoustic guitars. Applicable: Classical/Folk/UkuleleColor: Black + White Material: MetalSize: 87x54x39mm Package Contents: 1 x Guitar Humidifier 1 x Drip Bottle (Without Liquid)Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.