It is a gua sha product.

I’ve heard a lot that gua sha massage is good for blood circulation and facial swelling, so lately I’ve been using this face roller gua sha to massage my face, jawline, and tense areas of my neck whenever I have a spare moment.

Compared to not using it, it definitely feels refreshing, and I feel like the tightness in my neck is relaxing, so I am quite satisfied with it.