Specifications: 47inch x 35inch x 0.2inch (length x width x height), weighing about 14LB. The thickest and heaviest compared to other chair mats of the same size. 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, but more durable heavy duty than glass mat. Transparency: As crystal-clear as glass, the hard floor or carpet pattern can be clearly seen through MuArts upgrade version chair mat. Heavy Duty and Durable: 0.2 inch thick, weighing about 14LB, It is made from non-toxic and odorless special material, which can withstand 1200lb of pressure.