Humitrons are made of the most advanced material available. The tubes were custom extruded of the finest non-vinyl and non allergenic resin, soft enough not to exert pressure arond the F-Holes/Sound-Holes and sufficiently sturdy to minimize contact with the inside parts of an insturment. Our water-suction stems within the Humitrons absorb water ten times of their weight and then slowly release it through the holes.
To determine when to use Humitron, listen to your local weather forecasters. When the humidity falls below 50% it is time to use Humitron by simply submersing it in *water for several seconds, and while removing it wipe the access water off and place Humitron inside your insturment. Also bear in mind that the driest months are in the winter season and in the places where rain falls are low and color changing type moisture indicators since they only function on a relative humidity scale and become totally obsolete when the air is saturated with 90% water.
