AiBOB Office Chair Mat: our office floor mat is good for low pile carpet floors. It is ergonomically designed to allow effortless movement of office chair wheels, and provide good protection to your low pile carpet floor. Features: 1. The floor mat is BPA free and phthalate free for a healthy indoor environment. 2. The unique surface allows your office chair casters to move easily while carrying out daily tasks, but has enough grip to maintain controlled rolling so the chair doesn't skid around.3. the mat’s surface is strong and sturdy, so your chair’s wheels will easily glide across the mat, without scratching, sinking, or leaving indentations. How to use help: 1. Directly Unfolding the chair mat; 2. Turning it over and laying flat; 3. Rolling back; 4. Unfolding the mat. Put the studs face down. Specifications: 1. Material: polyvinyl chloride 2. Dimensions: (48 x 36 x 0.1)" (L x W x H) 3. The studs height: 1/6 inches 4. Weight: 6.8 pounds Package Includes: 1 x Office Carpet Chair Mat 1 x User Manual