Type of fiberglass cloth: Alkali-free Plain Weave, woven by warp and weft. It is a rectangular fabric that is flexible, soft and smooth, with no flaws or obstacles. Advantages of Fiberglass Cloth: It is heat resistant, corrosion resistant, insulating and flame retardant. It does not rust or rot, and is stable, durable, lightweight yet high in strength. Easy to use, it is an essential component in fiberglass repair kits. Big size: 50 square feet. It comes in folded packaging, which is easy to unfold without creases, and the edges are not curled. It is suitable for making a small boat or an RC plane. You can cut it into any size you want to repair cracks, holes, or gaps, which is very convenient. Widely Use: This fiberglass cloth is lightweight and strong, and can repair many surfaces including metal, plastic, ceramic, wood, concrete and more. It is ideal for repairing and making marine boats, RC planes, automobiles, surfboards, tubs, pools, and circuit boards. It is compatible with epoxy, vinyl ester, and polyester resin systems and easy to saturate with resin.