I brought this home and sat on it for less than 10mins and it the chair doesn’t roll and have dents all in the plastic. I am about to return this. It does not do the job.
I bought the low pile carpet mat and it kept moving so I bought this medium pile carpet mat and it is doing the same thing. The teeth are about the same length so I don't see the difference in the low pile and the medium pile except the price
The chair mat was a perfect fir for my work area. It is made of sturdy plastic material and is holding up very well with the weight of the chair and myself on it. I recomend.
The number of stars I gave this product has no meaning since the usefulness of a Chair Mat is only discernable over time; i.e. like how long before it starts to crack and break down. Hopefully I won’t know that for a long time. (It has been under my chair for a week now and it still working.)