Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not Durable

As several other reviewers have mentioned, this is not a durable product. I still have it but I don't use it, because large chunks have flaked off the edge. I will try to post a photo before I toss it.I estimate it lasted about 4 months before pieces started coming off.The worst part is, where did those pieces go? I hope they are not lodged in my gut.