Downing a turkey quickly has never been so easy. The Magnus Bullheads are designed to fly out of even the fastest bows to ensure a quick clean ethical kill. The large cutting surface of the blades was created for neck and head shots on turkeys and other small game. If your shot does happen to off its mark the blades act as a brake to stop the arrow from burying into the grass unlike conventional broadheads. The 100 grain three blade has a 3" cutting surface while the 125 grain head has a 4" cutting surface. Stainless steel blades are .048 thousands of an inch and the screw in ferrule is machined out of aircraft grade aluminum. Also includes the Magnus lifetime replacement guarantee. Per 3.