... /4mm 2.Oak top layer,3 layers,AB&CD grade 3.Poplar bottom&core,brushed ... ,stained,oiled oak three layers solid engineered laminate flooring YS-1Specification: MaterialOak top layer ... ,DD,ABCDMoisture content 8%-12% Top layer veener thickness 3mm or 4mm Core PopularColornatural ... surface. Among these 9 layers coating,3 layers include aluminium oxide.UnfinishedNaturalNo Treatment ...