MasterGrain, a trademark of Weber Manufacturing Technologies Inc. is a premium line of Fiberglass Entry Door Slabs and Sidelites with matched Fiberglass Door Lite Frames. Our patented ′Weber Grain Technology′ leads the fiberglass door industry with the look and feel of a real wood, offered in Mahogany, Oak and Cherry grains. Compare this and our high quality construction to any fiberglass door and you will see ′The Difference is in the Details′. Established in 1962, Weber Manufacturing is world recognized for building the finest tooling in the Home and Building Industry.