Vane Colors Vary The 4MM FMJ offers the most penetration and is precision-made in USA for the most accurate hunting arrow on the market. The 4MM Full Metal Jacket has been updated with a new spine configuration an all-new 8-32 point outsert system and a redesigned graphics. The standard 8-32 thread point outsert optimizes front-of-center for easier broadhead tuning and more durability. FMJ starts with an advanced carbon core foundation for lightweight strength. A full metal jacket adds kinetic energy enhances accuracy and pulls easier from targets. The combination provides the deepest penetration and more pass-through impacts for quicker kills and heavier blood trails. SPECIFICATIONS: 4mm Micro- Diameter carbon core with 7075 alloy jacket Pre-installed 4mm Nocks 4mm Aluminum Point Outsert (50 grains) Included Easy target Pull Straightness +/- .003” (Also available in .001” Match Grade version) Made in the USA