This office chair mat features no studded design made specifically for hard floor surfaces. Sturdy, tempered glass material, protects hardwood, tile, laminate, concrete, and vinyl floors from wearing and tearing caused by chair casters. Designed with a lightly textured surface for easy chair movement without skidding around. The strong grip also ensures safety when walking on it. Free from BPA, phthalate, and volatile toxins for a healthy indoor environment. A transparent surface allows the beauty of your floor to shine through. You just need to wipe the floor chair mat with a cloth and it will be clean. Fully transparent: This floor mat is almost completely clear. It looks very neat, organized, and is not tacky like plastic mats. You will hardly know it’s there and can still enjoy your floor without the eyesore. Compared to an ordinary carpet chair mat, it is more transparent, as clear as crystal. Dual Purpose: Suitable for carpet or hard floor, it is made of hard material, and it cannot be folded or curled, completely flat, similar to glass chair mat, more durable heavy duty. Transparency: As crystal-clear as glass, the hard floor or carpet pattern can be clearly seen through the upgrade version chair mat. Heavy Duty and Durable: 0.2 inches thick, weighing about 14LB, it is made from non-toxic and odorless tempered glass, Heavy-duty and durable, nonbreakable, which can withstand 1200lb of pressure.