Want the best mechanical broadhead that uses an O-ring to hold the blades closed during flight? Shockwave mechanical broadheads give you all the quality, sharpness and durability of an NAP mechanical broadhead at an economical price. Shockwaves fly like a field point - guaranteed. 1 1/4" cutting diameter Mechanical broadhead design O-ring blade retention system Field-point accurate flight Razor-sharp cutting blades Durable, cost-effective construction Compatible with compound bows and crossbows