... insulating 1. Doors structure:Engineered solid wooden door: fir wood core, natural hardwood surrounded in the lipping, tongue and ... lacquer or oil stain, can be matt or polish 3. Wood species: ash, sapeli, chempaka, Chinese cherry, black walnut, meranti ... , American cherry, makore, oak, maple, teak, mahogany, bubinga, wenge, merbau etc. 4. Dimension and design can be customized. High Quality ...