The Blazer Vane, with its unique design, begins steering and correcting immediately. The combination of the steep leading edge angle and material stiffness enables the air to flow over the vane in a manner that actually creates lift. This leaves the tip of each vane inside undisturbed air, similar to the drafting principle used in auto racing. This airflow created by the precise leading edge angle allows the tip of each vane to act like a rudder, which is noticeable at longer distances with the flatter trajectory Blazer Vanes provide. Blazer Vanes are 1.987 long, with a profile height of .568 and weigh just 6 grains! They work great for cross bow bolts too!!