This BGF Aerialite S-Glass is an extremely high performance cloth that adds approximately 20-30% more strength without adding more weight! S-Glass has the same working qualities as E-Cloth during the lamination process. When compared to E-glass, S-Glass laminates show significant improvements in tensile strength, flexing strength, flexing modulus and compressive strength. S-Glass Laminates also exhibit improved impact resistance and toughness. 27″ wide x 1yd SOLD PER YARD but not cut by the yard. For example if the customer orders three yards they get one continuous three yard piece.