The Bloodsport Night Fury Extreme is designed for use with compound bows and crossbows. 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". 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. Blades are 420 stainless steel.