article number: BVMDK
product id: 54014

starter kit 1x 70gr 49%, with 1 directional holder
• Humidity Control Kit for Stringed Instruments
• Humidifies and dehumidifies the air
• prevents warping, shrinkage and cracking of wooden instruments
• maintains a relative humidity of 40 - 50%
• The Attachment under the strings above the soundhole

Easy to use:

Just insert the humidifier and the rest will happen by itself! Boveda's unique bags have an osmotic membrane that automatically releases the internal moisture into the environment - at a constant 49% relative humidity. The special feature is that the membrane works in both directions, so that excess moisture can also be reabsorbed. There is no need for refilling at all. If the bag becomes hard and dry, it is simply replaced with a new one.