Humidity maintenance tools-- this cello panel humidifier is definitely an economical and affordable choice . Sound hole humidifier-- it's small in size, so that it can be carried with you, you can humidify and maintain your cello panel and sound hole anytime, anywhere. Violin-- characteristic and exquisite with professional design. simple and generous in design, smooth in lines. Violin accessories-- the excellent workmanship of our cello humidifier will bring you a good using experience. Violin case-- the convenient cello humidifier is suitable for cello, which is very practical and useful. Material: Rubber + sponge colour: Green Package Contents: 1 x Cello Sound Hole 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.