a, wall panels external b, Got CE,SGS,ISO certification c, Obtained patents d, 20 year fade warranty 1) wall panels externalextruded under ... anti-oxidants,dyestuff and so on . 2) More paramerers of wall panels externalSize:163*21mm,196*26mm, 175*23 etcLength:2 ... Dimension stabilitylength and widthEnergy-saving decorative wall covering panelswill not be out of shape after a long testing of 10 years ...