Guitar Humidifier: Portable Cello Humidifier:The excellent workmanship of our cello humidifier will bring you a good using experience. Instrument Humidifier: Cello Humidifier:Easy to insert, just put in water for 20 seconds, remove, dry the outside, and put into F hole. Universal Tool: Soft, rubber material, strong and , avoid frequent replacement and , practical. Cello Care Humidity: The Compact Size and Light Weight Easy to Put into Your Cello Bag or Cello Case, Ready to Use. Sound Hole Humidifier: Characteristic and Exquisite with Professional Design. Simple and Generous in Design, Smooth in Lines. Colour:White Material:Rubber, sponge, resin Size:36x2.5cm Package Contents: 1 * Musical Instrument humidifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.