Chairmat is designed & properly weighted for firm, low-pile carpets. Sturdy, 1/9" thick material protects your carpet from wear & tear caused by chair casters. Easy-glide rolling surface provides effortless mobility. Lightly textured top surface is slip-resistant & scuff-resistant. Studded bottom delivers superior gripping power. Roll-formed edge allows ease in carpet-to-mat transition. Free & Clear formula produces an exceptionally clear vinyl mat that is nonphthalate, noncadmium & BPA-free.