Hot & Cool Pad, Set of 2, Used

Used for about a month in winter with the heating function.
There is a slight stain on the item in the first picture (see pictures 5 and 6).

(Quoted from an online description below.)

(Hot & Cold Gel Pad) Fuji Sho Hot & Cool Pad, Small Size, Green (F9865) (12x29x1.5cm)

Just heat it in the microwave and place it on your shoulder. Relax your shoulders and neck!

・Gel type for a perfect fit! You can easily do hot compresses at home, and it can also be used as an ice pack if placed in the freezer. It won't harden even when frozen.

・For heating, use only the microwave. For reheating, adjust the temperature in small increments of 20 seconds.

・Can be used as an ice pillow in summer and a hot water bottle in winter. Reusable.

How to Use (Heating Time)
500W: Within 2 minutes
600W: Within 1 minute 40 seconds
700-1000W: Within 1 minute

*If the warmth is insufficient: After kneading the main body by hand, add heat in increments of 20 seconds or less while checking the temperature.

(Cooling Time)
30 minutes or more in the refrigerator

(Usage Time)
Maximum approximately 1 hour (varies depending on usage conditions)
Precautions *Do not heat with fire or hot water.
*Be sure to adhere to the indicated heating times.
*Never use the auto-mode for heating.

Thank you for looking.
Immediate purchase is welcome. Thank you.