The reusable heat pack is very useful.

Application:
Relax tight muscles and restore flexibility in a wide variety of ailments such as :
Muscle pain & soreness
Muscle spasms & cramps
Arthritis/Menstrual cramps
Chronic neck or back stiffness
The weights and size can be specified.

Insturction:
Fold the metal disc inside the pack, it will start crystallization. When the crystallization is completed, it’s ready to use.
To recharge, please place the pack in boiling water with cloth, heat it abouth 10 minutes or until crystal is dissolved.