... lacquer, Aluminum Oxide E0, E1 grade Black Walnut Engineered Hardwood Flooring Species: Oak, Elm, Merbau, Teak, Cumara, Maple, Birch, Okan, etc ... .6-4mmGrade: AB, ABC, CD, etc.Core Layer: Hardwood plywood, HDF, etc.Bottom Layer: Beech, Cork, etc.Joint: T&G with ... , each type no less than 500M2) Black Walnut Engineered Hardwood Flooring