Easton 4mm Full Metal Jacket Shafts 400 are precision micro-diameter arrow shafts designed for serious archers who value consistent flight and rugged durability. Built around a carbon core with a 7075 aluminum jacket, these shafts deliver reliable performance for field, target, and 3D archery, and are proudly made in the USA.

• Diameter: 4mm micro-diameter carbon core with a 7075 aluminum jacket for a strong, lightweight shaft
• Straightness: +/-.003 inches for predictable, repeatable flight
• Sizes: Available in 250, 300, 340, 400 to fit different spine requirements
• Material: Carbon core paired with a 7075 alloy jacket to balance stiffness and durability
• Origin: Made in the USA, supporting local manufacturing
• Pack Size: 12 shafts per pack (1 doz.) for easy stocking and setup

These FMJ shafts are designed to deliver straightforward improvements in archery performance. The tight straightness tolerance reduces variance in flight, helping you hit closer to your point of aim shot after shot. The 4mm micro-diameter reduces air resistance and contributes to a smoother, faster arrow, while the 7075 aluminum jacket protects the carbon core from nicks and dents during practice and competition. With multiple spine/size options, you can dial in the right stiffness for your bow setup, ensuring consistent spine alignment across your quiver. The USA-made quality delivers reliable manufacturing standards and support for higher-value, long-term investment in your archery gear. This 12-shaft pack is ideal for builders who need ready-to-use spares or for archers who like to match different setups for different shooting scenarios.