Used for humidification and maintenance of violin. Specially designed non vinyl and anti desensitization resin materials are used. good toughness when passing through the F hole and minimize contact with the interior of the instrument. The absorbent material used for humidity indicators can absorb more than 10 times its own weight of water and discharge it in the form of gas from the opening of the pipeline. Function: When the weather is dry, humidify the violin to prevent the piano board from deforming and cracking. Instructions: Immerse the humidifier in clean water and remove it after a few minutes.Squeeze excess water from the top so that the humidifier not drip anymore, and then wipe off the moisture on the of the humidifier.Insert the humidifier into the body of the piano from the F hole, the humidifier naturally evaporate the water slowly, please humidify the crotch from the inside to outside. Colour:Blue Material:Resin Package Contents: 1 * Violin Humidor 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.