Like all of the arrows in Easton???s FMJ series, the 6mm FMJ features a technologically advanced arrow shaft designed for penetration, accuracy, and clean kills. The FMJ starts as a carbon foundation using the Accucarbon process of fusing high-strength carbon fiber with aerospace grade resin for a more consistent spine and weight. This carbon fiber core is then permanently bonded inside of an aluminum tube, and the synergy between the two creates greater ballistics efficiency, more impact energy, and more momentum. The result is an arrow that???s highly effective on larger game. Features: ST RPS 8-32 inserts included (18 grains) Pre-installed H nocks Reduced-diameter 6MM carbon core with 7075 alloy metal jacket Easy target pull Straightness: ??.003??? Easton FMJ 6mm Size 470 Gray Shafts 12pk 326348 in Black/silver