All of our Mahogany EX5-Lite French Doors are dual pane tempered glasses. These French Mahogany doors are Exterior Grade and can be used for interiors as well. These Mahogany doors are the highest quality available in the market today. While many of our competitors have sacrificed quality by turning to MDF/Veneer door constructions to reduce production costs... we at ETO Doors have kept quality as our primary concern. The door you are viewing is truly solid. The stiles and rails are 100% solid Brazilian mahogany wood. Our Brazilian Mahogany is very carefully selected and is superior to other forms of mahogany in the market today.