How about Chen's Fu Zan Ai Tie? Is it useful?

The effect is very good! I happened to buy this last week and used it. I often have backache when I sit in the office every day. I don't know if it is lumbar disc herniation. I have been looking for time to go to the massage shop or moxibustion hall because I am afraid that the effect is not good, but the time is really limited, so I chose moxibustion stickers and bought many similar ones in the massage shop. Last week, I bought this Chen Guo Fu from my friend. I am used to comparing it. It's really bad inside and outside.