This chair mat is a typical vinyl product. I purchased it for my recently renovated home office. Unfortunately with the thin vinyl material combined with the carpet padding the chair wheels leave divots in the mat and to a lesser degree the carpet below. I would only try using this mat over the thinnest of carpets without padding. Otherwise I would avoid it.
Size of the mat is good a little bigger than the previous one. Appears to be solid enough but I do see "indentations" where the chair wheels are - hopefuly that won't be a problem over time.