Is it stiff? Does it have nubs? I want a rigid floor protector with no nubs. It needs to be flat on both sides.

Hi Kevin, Thank you for your question. We can confirm that the Valuemat is made from polycarbonate, our premium plastic mats are incredibly tough and durable with twice the impact strength of vinyl to provide a perfectly flat and rigid ergonomic easy glide roll surface. As the designed application for this item is hard floor, both sides of the mat are smooth backed. If you would like any further information on this range, or any of our products, please feel free to contact our customer service team who will be happy to help. You can email us CustomerService@FloortexLLC.com or you can call us on 615-208-9697. Kind Regards, Paige