Music nomad Humid-i-Bar replacement sponge for MN300
Very easy to install in the soundhole, our sponge maintains an ideal humidity level since it retains more than 10 times its weight in water.
This means it releases its water longer than any other guitar humidifier.
To determine if it needs re-humidification, simply open the door and squeeze the sponge with your finger. If it's dry, rehydrate it with demineralized water.
Euroguitar Reference : 116358