New Archery Products Shok Wave 100gr Expandable Broadheads - Want the best mechanical Broadhead that uses an o-ring to hold the blades closed during flight? Shockwave gives you all the quality, sharpness and durability of an N.A.P. mechanical Broadhead at an economical price. Shockwaves fly like a field point - GUARANTEED! Bone-splitting Tri-vex point cuts on contact for more penetrating power Aircraft aluminum ferrule for unyielding strength Easy installation: o-ring fits behind the blades Sharp, tough and replaceable 030in stainless steel blades make Shockwave economica