Smooth, texture-free, glass-looking mat is great for showing off designer rugs or carpeting. Mat is designed and properly weighted for firm, low-pile carpets with padding. Unique notched-stud design grips carpet without piercing or damaging carpet backing. Beveled edge delivers smooth chair movement. Free and Clear formula produces an exceptionally clear mat that is nonphthalate, noncadmium, BPA-free and lead-free.