Enhance your archery performance with the Altra 204 Insert and Outsert 400 Spine. Designed specifically for Altra Arrows 204 Shafts, these components are crafted from high-quality 7075-T6 aluminum, ensuring outstanding durability for both practice and competition. The secure insert depth of 0.875 inches provides a reliable fit, while the outsert encapsulates the arrow end at 0.43 inches for additional protection and stability in flight. Each package includes 12 inserts and outserts, making it convenient for avid archers. The pre-installed rubber O-rings significantly reduce vibration and improve the concentricity of your arrows, resulting in enhanced downrange accuracy and precision. Compatible with various spine sizes*250, 300, 350, and 400*this versatile product also accepts micro FMS insert weights, allowing you to customize your setup to meet your specific needs. Upgrade your archery gear with the Altra 204 Insert and Outsert 400 Spine and experience the difference in performance and accuracy that comes with premium components. Features: * Material: Constructed from high-quality 7075-T6 aluminum for exceptional durability * Insert Depth: Secure insert depth of 0.875 inches for a reliable fit * Outsert Protection: Outsert encapsulates arrow end at 0.43 inches for added stability * Vibration Reduction: Pre-installed rubber O-rings reduce vibration and improve concentricity * Pack Quantity: Comes in a convenient 12 pack for frequent use * Spine Compatibility: Available in four sizes: 250, 300, 350, & 400 spine * Weight: Total weight of 53 grams for optimal balance * Customization: Accepts micro FMS insert weights for tailored performancetable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Item Category Code: 1100 Product Group Code: 1100A Product Sub Group 1: 1100A2 Inactive: No