Bests & Worsts Reviews from Amazon

I wanted to love these mats and was excited to get my first workout in on them (bought 3 packs to cover a smallish basement gym area). Everything was going great until I was doing supine crawls and realized there were small pieces of glass (or possibly extremely hard plastic) embedded in the mats and also in my palms. Not sure if this was a QC issue or if these mats contain some sort of hard plastic but cannot keep these when there is a danger to myself or my 2 and 3 yr old children. One of the pieces that stabbed me actually drew blood. Do not recommend.