X-lock 2-blade system ensures blade retention on impact. Individually spin-tested for optimal down-range flight performance. Practice blades included ultra-sharp replacement blades included: one set. The Endgame is an over-sized bone breaker tip for maxiumum penetration on all sizes of game.Features:Single piece CNC-machined grade 5 titanium ferrule. X-lock 2-blade system ensures blade retention on impact;.031 thick ultra-sharp replaceable razor-sharp stainless-steel blades;Individually spin-tested for optimal down-range flight performance;1 3/16" cutting diameter. 100 grains