The plastic seems pretty lightweight and not very rigid. I don't think this mat is suitable for anything other than a hard surface floor. When used on carpeted surfaces this mat will show indentations from your chair legs/wheels.
It's possible I ordered the wrong one for my rug but the chair mat is too pliable. The chair rollers indent the mat and the mat moves around a lot. I constantly have to rearrange it.
Good for the short time but will need something heavier duty for the long haul. Good enough on short notice. Will definitely buy from Staples again. Great delivery and great service as always.