"ORIGINAL SPIN WING VANE, WHITE; 1.750 IN; CURVED POCKET DESIGN OF VANE TRAPS AND COMPRESSES AIR FOR HIGH SPEED ACCURACY; SPINS TWICE AS FAST TO IMPROVE YARDAGE/FLIGHT ACCURACY; HIGH SPIN ROTATION; MINIMUM FLIGHT DRAG; SUPER THIN CURVE ALLOWS TIGHTER ARROW GROUPS/BETTER BOW FLEXING; WORKS WELL WITH COMPOUND OR RECURVED BOWS"