this review title is: clearly made of resin and the content is: although this product works well to cool my under eyes i was pretty disappointed with the quality there is a black dot baked into the large roller that could not be removed with water or scratching at it there are several bubbles in the small tool more flaws can be seen with the naked eye rather than in the pictures i tried i was mostly disappointed because i thought that they were sending me a product made of pretty stone and these are clearly not stone are most likely some sort of resin the small roller does not roll very easily but i could have looked past that i hope this was helpful.there are other information for this review, one is this reviewer did purchase it and the other is 133 people think this review is helpful.