I bought this product and when I received it I tried it immediately the first time I put it to my heel with not a lot of pressure the roller stopped spinning and it made a really loud whining noise. I had a replacement sent out and it worked perfectly. I have used the new file on both heels it feels very sturdy compared to the first one. I chose the 4 star because it did take getting 2 to have one that worked. The material is plastic and I guess I don't expect more for the price. Yes I would recommend this product.