Fiberglass Sheet, Material Fiberglass, Color Dark Gray, Thickness 0.375 in, Overall Length 4 ft, Overall Width 4 ft, Resin Type ISOFR, Maximum Temperature 150 Degrees F, Thickness Tolerance +0.125/-0.063 in, Type Smooth, Standards ASTM D-635, ASTM E-84, NSF Standard 61-Certified, Top Surface Texture Smooth, System of Measurement Inch, Shape Sheet, Package Quantity 2