Office Marshal Black Polycarbonate Office Chair Mat - 36" x 48" - Hard Floor Protection - No-Recycling Material - High Impact Strength Black - 100% pure polycarbonate - Phthalate free, BPA free, PVC free and free from harmful toxins 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. Designed for use on hard floor surfaces - not suitable for carpets | 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).