Includes components for 6 Sonic Heads. Easy assembly instructions are provided. Sonic Heads are specifically designed to maximize accuracy and penetration. The 75 and 100 grain weights feature a cut diameter of 7/8 inch while the 85 and 125 grain weights have a 1.0 inch cut diameter. Sonics incorporate three identical blades for perfect balance and silent flight. Since the blades are solid, they resist the air cavitation that has plagued fixed blade broadheads at speeds in excess of 275 fps. Their forgiving nature allows archers to shoot broadheads like Olympians.