Description: Experience the Beauty and Durability of Mastergrain Fiberglass Doors. Crafted with an exclusive process to replicate the organic grain of real wood, offering a stunningly realistic appearance. Engineered and built in North America by skilled technicians, these doors ensure the highest quality and craftsmanship. Experience the Beauty and Durability of Mastergrain Fiberglass Doors. Crafted with an exclusive process to replicate the organic grain of real wood, offering a stunningly realistic appearance. Engineered and built in North America by skilled technicians, these doors ensure the highest quality and craftsmanship. High-density, CFC-free polyurethane foam core enhances energy efficiency and sound abatement. 4-1/16″ stiles made of 3-7/16″ engineered wood, and a 5/8″ hardwood maple edge cap. Top and bottom composite rails are rot-resistant, ensuring long-lasting performance.