This does not have to sharp pointy pins on the bottom. As a result it slides on the carpet and every few days i have to pull it back where it belongs. Wish at least some of the pins on the bottom were the sharp ones. They stay put.
My fault I have a professional office chair and standard house carpet. Rollers on chair sunk into mat within a day without anyone sitting in chair. Had to return it. Store took it back with no problem.
This is the 2nd chair mat that I purchased and sadly this one also did not work under my chair. It buckled in many spots and also dented in all areas where the wheels were. I will be returning this mat again. This mat is on top of carpet.
I know 200 lbs is heavy but I expected this mat to not sink into the carpet. I am not completely happy with it. Time will really tell my satisfaction level.