Compared to standard shingles, SureNail® Technology provides you with 2x the bond strength, and up to double the common bond in the nail area. With SureNail® Technology, strength and durability are built into every TruDefinition® Duration® Series shingle. The SureNail® strip, a tough-engineered woven fabric strip in the nailing area, provides an easy-to-see target nailing area for a fast, reliable, quality installation. The heritage of the Owens Corning brand means you can be sure with SureNail® Technology. See the strip, trust the grip®.