Chairmat protects floors and carpets from wheel damage. Transparent color allows the carpeting to show through. The textured surface is scuffresistant. The stud design grips carpet, but wont harm carpet. Corners are rounded. Mat is made of polyvinyl chloride (PVC). Mat is designed for use over low to mediumpile carpet. Overall dimensions include 20 x 12 lip. Thickness is 0.145.