[Humidity regulator] Hall Partner

It is used by attaching it to the sound hole part of the guitar.
It has a built-in moisture regulator "Moislegato" for musical instruments, which prevents cracking and warping of the instrument body.
It is more effective when used in conjunction with a neck partner or a moisturizing partner.

Ingredients: Water-absorbing polymer, polyester nonwoven fabric <br>Material: felt fabric