Chairmat protects floors and carpets from wheel damage. Transparent color allows the carpeting to show through. The textured surface is scuff-resistant. The stud design grips carpet, but won't harm carpet. Corners are rounded. Mat is made of polyvinyl chloride (PVC). Mat is designed for use over low to medium-pile carpet. Overall dimensions include 20" x 12" lip. Thickness is 0.145".