The blade containment system on the Night Fury Extreme flies with deadly field-point accuracy. What you may not expect is the punishing damage this blade delivers upon impact. Two curved, cross-opening blades instantly open on contact to create a cutting diameter of 2.25 inches. And because the Night Fury Extreme doesn't require any rubber bands or O-rings, there is little energy loss making hits all the more devastating. 2.25 in cutting diameter mechanical blades Integrated chisel tip 420 stainless steel blades 7075 aircraft aluminum ferrule Patented Blade Retention System keeps blades closed until entry No rubber bands or O-rings True field-point accuracy designed for use with compound bows and crossbows