This plastic is not a heavy as I expected though heaver than the one it is replacing. The old one cracked from flexing that chair rollers caused. I expect the same thing will happen with this one We don't have Extra High carpet and the chair roller still dent it. they recover from the dent but so did the old one that cracked from the same caause.
I decided to save money and bought this flimsy mat. I see that the chair is already leaving marks that don't go away. That's why I retired the old one I had. It makes it difficult to navigate the chair when there are dents that don't disappear.
My chair sinks into the carpet leaving dimples in the mat that the chair gets stuck in. I am not that heavy 150 or so and the carpet in not that deep. If I had it to do over I would spend the extra $15 or so dollars and get a better quality mat.