It is a plastic face roller.

Stainless steel or wooden gua sha tools can be very painful to use if you don't control the force properly. Perhaps because I rubbed too hard, I've even gotten bruises on my face or breakouts.

Since then, I have purchased and been using a plastic face roller that is gentle on the skin.

I rub it on whenever I watch TV or use my phone. There isn't a dramatic effect, but I feel like my facial lines are becoming more refined, even if only slightly.