A coarse checkered fabric woven from E-glass rovings in plain weave, with clearly visible warp and weft bundles — the most widely used reinforcement for hand lay-up and laminating. Typical weights are 200, 400 and 600 g/m², thickness about 0.2–1.2 mm, and widths of 1000–1250 mm, with wider options available. It wets out quickly, conforms well between plies and is cost-effective, making it suitable for boats, tanks, cooling towers, automotive parts and general FRP products.