Features: Specifically designed for string instruments, this humidifier prevents panel cracks caused by dryness through precise humidity control, ensuring optimal instrument preservation and sound quality. Crafted from durability, its universals design fits violins, cellos, and other string instruments with simple installation for instants moistures regulation. Ideal for musicians, luthiers, and music student seeking reliability protecting against seasonal humidity fluctuations that damage delicate wooden instruments. Maintains stable humidity levels during rehearsals, performances, or storage in various environments like concert hall, studios, or dry climate. Compacts and travel friendly, it safeguards instruments from structural warping while preserving integrity year round through scientific moistures distribution technology. Specifications: Dimension:0.8x10cm/0.31×3.94in Component:plastomer Package Includes: 1set String humidifier note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.