... .Oak top layer,3 layers,AB&CD grade 3.Poplar bottom&core,brushed,stained,oiled oak three layers solid engineered laminate flooring ... ,1830*189*15/4mm,1220*158*14/3mmGrade AB, ABC ,CD,DD,ABCDMoisture content 8%-12% Top layer veener thickness 3mm ... moisture content of the room in a proper condition. oak three layers solid engineered laminate flooring YS-1