The dependable difference for the casual user. Light weight, durable performance for moderate use on carpets up to 3/8" thick. Easy-glide rolling surface provides effortless chair movement. Studded design secures mat from moving while protecting carpet from caster wear, spills and heavy traffic. Free and Clear non-phthalate, non-cadmium formula promotes a healthy work environment while offering exceptional clarity and durability. Smooth beveled edge for easy carpet to mat transition.