The mat is so thin my chair has made dents in the plastic causing my chair to grap in the indents. DON'T BUY ONE! Spend more and get a THICK mat to start.
The mat served our purposes for the most part of having a mat for rolling my chair on top of my carpet. But the mat is a little on the thin side and so the wheels are already making dips in it. I sort of wish that I'd bought something sturdier.