ULS Bo-Tuff E Glass is a continuous unidirectional “E” fiberglass laminate combined with a 50/50 woven fiberglass inlay (scrim) that has high strength and stiffness along the longitudinal (0) axis and provides cross strength (90 degrees to the longitudinal axis). Sanded 1 side. Quantity discounts will be applied by BPI when the order is shipped. 72″ lengths. Black ULS has been recently discontinued but is now available in UL.