This mat is very very good. My chair moves already around all the time on this mat and keep it simple, which I think is just great. It's big enough, stable and has knobs below what they anchored in the carpet clean. If I had had this before, my carpet would have been very, before I had put the mat over and under my chair. Practical and well. Would I buy again immediately, but my stops just yet, which I find very very good.
