Easton???s 4mm FMJ is their flagship hunting arrow, offering extreme penetration and outstanding accuracy. The 4mm FMJ has been redesigned with an updated spine, a new finish, and includes standard thread outserts ??? this translates to more kinetic energy and minimal friction. Like all of the arrows in Easton???s FMJ series, the 4mm 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 of the 4mm FMJ: Highly effective on big game 4mm Aluminum Point Outsert included (50 grains) 4mm Micro- Diameter carbon core with 7075 alloy jacket Pre-installed 4mm Nocks Easy target Pull Straightness +/- .003?g (Also available in .001?g Match Grade version) Easton FMJ 4mm Size 300 Diamond Plate Shafts 12pk 30158