Smooth, glass-looking mat is great for showing off designer rugs or carpeting. Ideal for most medium pile carpets. Unique notched stud design grips carpet without piercing or damaging carpet backing. Beveled edge for smooth chair movement. Extra slow processing and high-grade materials combine to produce this smooth, texture-free, glass-looking mat. Free and Clear formula produces an exceptionally clear mat that is nonphthalate, noncadmium, BPA-free and lead-free.