A two end plain weave fiberglass cloth is just a plain weave with one of the fiberglass yarn bundles laying next to each other and counted twice. If it were both the warp and fill it would be a basket weave. 7544 has four G37 yarn in both the warp and fill. The warp yarn consist of two G37 twisted together but laying side by side where the fill yarn have all four G37 twisted together. Microscope photo to the right.