Premium rigid-style vent. Includes 3' ring shank nails for easy installation. No end caps needed. Cobra Rigid Vent 3 removes excess heat, prevents roof rot and promotes energy efficiency. Provides 18 square inches per lineal foot of net free ventilating area. EasyTear feature allows you to hand tear product in 3' increments. No knives necessary and less waste. Extra-flexible hinge design allows installation on 3/12 to 16/12 sloped roofs. Width is 13.7' overall, and 11.5' for the top panel. One box contains 10, 4' lengths.