Office Marshal Chair Mat, PVC, 40" x 48" - Hard Floor Protector | Clear, Rectangular Clear PVC Vinyl chair mat, allowing the aesthetic of your floor to show through. Designed to prevent against wear and tear caused by office chair casters. Allows your office chair to move freely while carrying out daily tasks, helping considerably reduce the risk of leg fatigue. To avoid damage to floors, these mats are free from chemical adhesives Certified by TV Rheinland (a global provider of technical, safety, and certification services throughout the world).