Clear polycarbonate carpet protection mat to prevent carpet wear caused by chair casters Incredibly tough - the ultimate in quality, clarity and durability; will not crack, curl, discolor or smell Provides ergonomic benefits by providing easy glide movement and reduced leg fatigue; clear formulation allows the beauty of your carpet to show through Certified to GREENGUARD standards for low chemical emissions into indoor air Gripper back ensures stability for use on low to medium pile carpets up to 1/2"; rectangular 48" x 79"; mat size may vary slightly due to manufacturing process