Hexcel HexForce Fiberglass S-Glass Plain Weave 3.6oz/123gsm Style 4522 F81 Finish

S-glass creates about a 25-30% increase in breaking strength from the E-glass. Used in applications where the highest possible strength is required while keeping weight to a minimum. This material was made by Hexcel, a leading manufacturer of composite materials in the USA, and their long lasting presence in the composite industry will ensure you receive a quality material.