Ecotex Marlon BioPlus Rectangular Polycarbonate Chair Mat for Hard Floors, Rectangular, 45 x 53, ClearGuaranteed not to sink, crack, curl, cup, discolor or smell under normal use and correct application; high clarity BioPlus formulation allows the beauty of your flooring to shine through.Lies instantly flat from delivery for immediate and effective use; no need to wait for the mat to flatten.Unlike vinyl, polycarbonate will not react with varnished or lacquered wooded floor surfaces and is compatible with under floor heating systems. WARNING: This product can expose you to Bisphenol A (BPA), which is known to the State of California to cause Birth Defect/Reproductive Harm. For more information go to www.P65Warnings.ca.gov. - Birth Defect/Reproductive Harm:Bisphenol A (BPA)