The Thunderhead is widely recognized as the finest fixed blade broadhead ever created. The sharpest blades. The best quality. More animals have been taken over the years with Thunderheads than any other broadhead. Patented micro grooved ferrule greatly increases flight accuracy and penetration power. No other broadhead in the world flies as true as the Thundherhead, period. The Diamize sharpening process creates the sharpest blades in the industry for massive hemorrhaging and knock down power. These are the sharpest broadhead blades ever created. Sharper blades equal quicker kills. 100 Grain. 18 Pack.