NAP Ignite 4 100gr Fixed Broadhead - 3 Pack - The Ignite 4 has a X-lock 4 blade system ensures blade retention on impact. One-piece ferrule for maximum accuracy and consistency in the field. Individually spin-tested for optimal down-range flight performance. Single piece CNC-machined Grade 5 Titanium ferrule .031in thick razor-sharp replaceable stainless-steel blades Practice blades included 1-3/16in cutting diameter