Review (1/5): WHAT is this made of!?!! Smaller and lighter than I was expecting
I ordered this because I was intrigued by the bumpy shape. I've tried a similar shape in stone and really liked it better than the traditional smooth edge, unfortunately this didn't live up to that stone tool. I usually prefer stainless steel as it has a heavier hand feel and can't shatter when I accidentally drop it. This tool was very light, and the shape wasn't carved, it was pinched/indented like this is made of a flimsy metal. I would guess maybe aluminum. I looked up Terahertzite mineral and found nothing, as it if doesn't exist, I could only find Terahertzite radiation/wavelengths. So to be honest I have NO idea what it is made of! It is also smaller than traditional gua sha tools which made it uncomfortable to hold in my hand and try to apply pressure to tight muscles with it.
Overall this is a hard pass for me and I suggest that it is for everyone else too.